Falling for my guy bestfriend.

Things have gotten.. you could say weird. He's been mentioning to me how unhappy he is in his relationship and telling me how he's thinking about calling it off because all she does is make him miserable and dictate him. I tried backing away, because I had thought that he was coming my way for comfort and I was stopping him from fixing. Which I later determined wasn't the case when he appeared at my doorstep at 11:00 pm to "talk" about how to fix things. As we were talking things got SUPER odd and he brought up having feelings, to which I was shocked upon because I saw it, but the vibes disappeared. A few nights have gone by and he came back down to my house for again another talk because they fought like hell, and she began shaking his choices for what he wanted to do and how he should only work part time and all money go to her. Note:we're only 17/18. But she's a looney. After him discussing his issues, he began to cry. He begged me to sit down with her and talk woman to woman to see if she was able to be pulled into perspective. Which seeing my best friend cry literally put me into tears.. which brought us to hug, a brief stare which almost led to a kiss, but I pulled away and told him I'd talk to her. But he needed to make it right, and end things the right way because I didn't want to interfere. I made it clear that I would be there, but I won't play "girlfriend" to make him feel good. 

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I don't know what it is, I don't know if it's my heart trying to comfort and show the love he's so desperate to have, but I can't exactly pull myself together. Could I be catching feelings? Or is it so simple that it could be me trying to show how it should be? 😩 I want them to work, I really do because she has him so wrapped but he can't get away. I know what did it for me was having him cry in my arms begging for help because she is driving him crazy.