The relationship started off amazing of course. We fell madly in love. We went a year without any type of argument. Fast forward. We were engaged when we found out she was pregnant. Both of us were very excited. Then she was depressed for 2 days, said some mean things out of nowhere and left me. I didn't know what was going on, I was hurt and said mean things back. She didn't talk to me for 5 weeks. It destroyed me. Then all of a sudden she was back to her normal nice self. We said we would take it slow, but on the 2nd day of seeing her we were back together like it didn't happen. 

I started seeing a terrible attitude from her. A lot of snapping and yelling for no reason. I chalked it up to pregnancy and would be as supportive as I could. A lot of times a hug would calm her down, or putting my hand on her leg. After the baby came it became a nightmare. She would constantly yell at me. She would be depressed for days. I figured it was the stress of being a new mom. Our daughter is 2 years old now. This never stopped. One day she is madly in love with me laying in my arms talking about having another baby. The next day she hates me and pushes me away and won't even text me. Then she is fine again the next day, but still snaps at the smallest things. These weird mean outbursts. One day I am the greatest dad ever and she appreciates all the help. The next day I don't help enough. There are even some days where she acts or looks at me like I am a stranger. It's very weird. I walk on eggshells everyday. I never know which version of her I am going to get. If we have a family gathering she is on her best behavior, I am thinking there is the girl I fell in love with, then when we get home she is back to being mean again. The intimacy stopped a couple months ago. She apologizes and says she has no interest in sex right now but she loves me. I thought it because she is depressed. She tells me she can't ever get out of her head and relax. She doesn't feel sexy because she has gained weight. She definitely has some anxiety issues. It takes her awhile to relax after work and the drive home. She has road rage pretty bad. When my daughter is being bad she says she wishes she never had her. Which destroys me every time. Then an hour later she is cuddling with her saying how much she loves her. I have never seen so much change in emotion so quickly in my life. 

She screamed at me in front of a crowd of people on a family trip 2 weekends ago, 5 minutes later she acts like it didn't happen and wants to hold my hand and hug me. I am a super nice and calm guy, but after being rejected for sex, pushed away for no reason every other day of the week, I am exhausted &amp; frustrated. I feel like it's triggered when my daughter is being bad or when she has a terrible day at work.

I usually try to leave the room when she is in a rage and let her calm down. I realized that if I get mad and argue back she threatens to leave. I've tried everything to keep her happy. I've heard her family mention that she had to go talk to a psychiatrist for awhile during high school. She tears up when it's mentioned and won't talk about it so I don't push the subject. Her mother is at our house constantly, on an everyday basis. They talk for hours and hours. And when her mom finally goes home then they start texting. It's like they can't go a couple hours without talking. We can barely do any family stuff without having her mom go also. It's extremely weird. We always have to do stuff with her family. We never do anything with mine.

I have put up with way more than I would have with anyone else because I want to be with my daughter everyday and be a family. A lot of times I feel like I need to protect my daughter from being yelled at so much. If I make an hour trip to the store when I get back she is so frustrated from watching my daughter without me.

Sorry for the long story. What I am getting to is that we went to bed fine and she woke up hating me again for no reason last week. She started arguing about something that didn't matter and I yelled back. I had it that morning and couldn't hold it in. After I yelled back she told me she was "done". She took my daughter and left. We didn't talk for 3 days. I know she can go without talking and it's nothing to her. She did it when she was pregnant. I broke the silence and told her I needed to see my daughter. She let me pick her up from her mom's. She hasn't said much. Only stuff about my daughter once or twice a day. I feel like I have put in all the effort the last few months. I don't feel like chasing right now. I want to be a family but I want her to get help. I don't know if she will. I told her dad that I didn't want this and wouldn't abandon my family. He seemed to know what was going on with her and said he would talk to her. If she doesn't want to be with me then I will make it through. I love her still so it would be hard. I feel like I am a good guy though and a good dad and I don't run away. I'm not perfect though. I am sure there are some days where I could pay more attention to her but I need to escape and play a game or read a book for an hour.

Should I try to talk to her? Leave her be to think? In my mind I am preparing for it to be over just in case it really is. She was crying when I dropped my daughter back off. Was I supposed to not left her leave when she said she wanted to? Was it a test? A game? Was I supposed to beg her not to leave?

She has had the opportunity to get her things from our place while I was at work. All she grabbed was shoes, a few outfits for work, diapers, a few outfits for my daughter, and a couple toys. I feel like if she was serious more of her stuff would be out of the house.

I think she may have borderline personality disorder. I just want to talk to someone that has gone through this. It would help.