Ok, so this might seem a bit... Confusing, so I'm sorry if this is hard to understand, I've got a lot of info to explain as simple and fast as possible:
Ok, so I was dating an old friend of mine, we'll call her....Mary. She was in band with me for 4 years before we were ever seriously involved, after a few weeks, her mom had taken her phone because she wasn't doing her work and failing classes. She got her phone back, but still ignored my texts, cause she didn't want to tell me she didn't have time for a relationship, so we broke it off. NOW, my best friend's ex is a good friend of mine, we'll call her Sarah, and I asked her out but got shut down and she had just been rejected by a guy who only saw her as a friend. I've like her for a good 6 months now, and I find her adorable. But she's not very stable, physically emotionally, or mentally. With vomiting problems from an old eating disorder to depression, cutting and selfmalnouriahment she's not too easy to take care of, but she's finally letting me in to care about her.
But just 30 minutes ago, I texted Mary, figured I'd check in, cause we're still old friends, right? She ended up going to bed, so I said good night an thought about it... What do I do if she wants to get back together? I care about both of them, and have discussed with them seperately about getting an apartment together. Mary has the beauty, stability and the courage to go in for a kiss before me, or ask serious questions in person rather than on paper. Whereas Sarah is a much more enclosed person, while I find her adorable and fascinating at times, she is a lot better spoken on paper and I don't want to drop Sarah an go to Mary like it's nothing, cause I'd be worried about her comitting suicide. Maybe I make my choice of which one, let the other down easy, and gradually, and then wait a few weeks to make sure we're cool and things have cooled down, THEN make the move to the other.

You know I think the best way is to build your relationship, not in a girlfriend way. If you're scared about the girl commiting suicide why not try to be best friends with her. You don't need to have a girlfriend or boyfriend relationship. Just be a good friend that they can rely on. If you are still thinking which girl to date I'd say don't date yet, but develop your relationship as friends and get to know them more. That may help you come your decision, but I'm no master of love because I've never dated someone before. Even though some things I said may not be helpful to you I hope some of my advice no matter how small will help you.

Well, I will work on it then, I've decided to see how the next week it two goes, and depending on how we're all feeling, I'll work on myself. We're already good friends, and we're coming along well, my ex has known me longer obviously, but she doesn't get all soft on me, I'm a big softie under my "cold asshole" exterior, and Sarah is willing to get soft and mushy with me, but my ex won't, kind of a disappointment, I have tricked her into getting in her feelings before, but we're more friends than anything. But again, all in time; patience is a necessity for love to blossom.