Alright so basically, I reconnected with someone I used to know overseas when I went abroad for a year. We started talking on instagram and found out we share a lot of the same interests. We've been getting closer and closer the past two months and they told they have BPD, and it's ruined every relationship/friendship they've ever had. 

They fear I am going to leave them one day, but I will never accept that as a possibility, I told them so and we became a lot closer ever since. They confessed to me that I am their "favorite person". I assured them that I would never ever let them down or leave them. 

This person means the world to me, I've been lost for so long and everytime I chat with this person I am over the moon. They told me that they deeply care for me as well and that made me so happy. They shared stuff with me that they've never shared with others, we've gotten so close. I've never felt this way about anyone in my life before and I confessed that I love them, they were happy and said they loved me back too.

I suppose I should mention that a couple days after I reconnected with this person, they said they were going to kill themselves. I tried my best to talk them down, I sent messages on every form of media. I called mutual friends in their area to get to them and stop them, and thankfully they got to them before they did something. We got so much closer ever since then, I keep telling them that I am always there for them and they appreciate that. I want to try and meet up with them and have expressed this, and they shared my sentiments completely. 

We could chat for literally half a day, talking on the phone, sending snaps back and forth. But they are still hung up on their ex who abandoned them a week before we reconnected. The ex was the reason they tried to kill themselves. 

Recently they cried to me telling me that they can't forget about their ex, and it hurts them so so bad. I realize that they still have feelings for their ex and I respect it, but I told them their ex is a bad person who doesn't deserve the time of day. They were grateful for that, but ever since then we've been slowing down, they take a lot longer to respond to my messages. 

It's only been a couple days like this but I feel so unusual. They are all I can think about, they are the funniest, most genuinely amazing person I have ever met. I don't know if I did something bad by prying into their past with their ex, telling them that he isn't worth it. I just want things to return to how they were, and I am willing to do anything to be there for them in the right way. They've been distancing from me and although we told each other we would never leave each other, I'm just terrified they're gonna leave me one day.

Can anyone give me advice on this matter please? I just want to know how I should handle this situation. Should I try and just give them a little space? I just don't know what to do.