TLDR: I am feeling depressed about some recent events that have happened in my life and I would appreciate any tips or advice for helping me make things better for myself.

I am 21 years old and the only family I have is one brother (23) who we can call Jake. Jake and I have a decent relationship but its not up to the point where it is the best sibling relationship possible. I am still cool with it though as my brother is quite caring in general. The only problem though is that with only 1 person in my life who I can even call true family, I have never really felt genuinely cared for or loved by anyone and I had a relatively sad upbringing as a result. Despite that though, Jake and I both persevered through our childhood and both of us were able to make it to college by supporting each other. Here's the best part, when my brother was 18 and I was 16, he met a girl (18 F) in his first year in college who I would call Kendra. They became very close right away and Jake introduced me to Kendra soon after.

I started liking her right away honestly, I could tell clearly that Kendra loved Jake a lot and to make things even better, she was just such a nice and awesome person overall. I found her to be so kind and caring, which is something that I had never gotten from anyone besides getting it from Jake on some occasions and the two of us became very close as well. I liked her so much that I asked her a week after meeting her if I could call her my sister and she gladly accepted. Jake and Kendra were together for four years and they had every intention to marry after completing college. Over these four years, I hung out with Kendra a lot whenever her and Jake were together and she was always so nice, and the best part is that we had very similar interests so that only increased our bond. Honestly for the first time in my life, I felt happy knowing that my brother was in safe hands and that I also had someone now who actually treated me like a caring older sister would treat her younger brother.

Unfortunately, a year and a half ago, Jake and Kendra were both in their last years of undergrad and as you can assume, the tension that the end of a college program could cause led them both to start arguing with each other quite often and they both started to break apart. Their relationship had been nothing but a wonder for 4 years but just before completing the last years of their undergrad, Jake and Kendra broke up. I'm not gonna lie, I was devastated that things had turned out the way they did because Kendra had literally become like an older sister to me but despite my sadness at this outcome, Jake assured me that things will be alright and I trusted him too.

Last year, Jake met another girl, let's call her Sally, and the two have been together since then. When Jake told me he had met Sally I was excited to meet her as I thought she would fill the void that Kendra leaving had left in my life. Let me just say this though, the pain and even despair that I went through before Kendra came into the lives of me and Jake, seems like nothing now when I compare it to life after Sally came along. I met Sally for the first time last summer, and at first I thought that she was a somewhat nice person although nowhere near Kendra. However, having spent a lot of time with her over the past year, I find her to be completely evil. Let's not even get into how mean she is to me, it's just horrifying, but to make things worse, she also gets a kick out of taking every opportunity to put Jake down as well and make both of us feel inferior. For some reason that I can't even understand though, Jake is somehow totally blind to what Sally's true character is and I have watched him slowly become a doormat for Sally to walk over. Kendra would never do that, she was literally such a kind soul and she cared about both me and my brother so much and her parents were so awesome too. Sally on the other hand is such an evil person basically using my brother right now and giving me hell and her family is also terrible and evidently hate us as much as possible.

Why does this stuff have to happen to me?!? Kendra brought the best out of my brother as well and made both of us so happy but Sally is literally the opposite and I absolutely despise her. NGL, I do have some anger towards Jake as well for making this stupid decision and I am also mad at myself for not doing more to keep Jake and Kendra together. I don't know what everyone will think, but I feel like all hope is not lost and I can still make things right, because I have noticed that deep down, Jake misses Kendra too, but I'm not sure he wants to admit that thought considering he so blindly likes Sally. What should I do to solve this problem? I have started entering depression again ever since Sally came into the picture and I can't see Jake being her doormat like this. I miss Kendra very much and I feel that I at least have to try to bring the two together again somehow and workout things (which I would consider to be minor). Talking to my brother is a nonstarter but I know that Kendra was always very thoughtful and understanding. What would be your advice? Should I talk to her about this and spill out my feelings? Thank you