Who can answer my questions on love?

Hmmm..here's my thoughts on this. When I was 13 I was put in a psych ward. I met this guy Ethan and we agreed when we got out we would keep in touch. We did, and started dating. We dated for 4 years. I really thought I was in love with him, but at the end, I just all of a sudden didn't like him anymore. I'm not really sure why. I think I realized that I only really thought f him as a friend. It was a really really messy breakup. Then a little while later, I met this guy Andy, and we were always thinking exactly the same. I thought this meant I was in love and we were meant to be together since he was like the male version of me. We only lasted a few months. Now I'm dating this guy named Sloan. Ive never felt this way about anyone, we would do anything for each other, have been through a lot, always care so much about the tinies little things about each other. And with the sex thing, he's the only one who flat out told me, "I don't think we should have sex yet. We should wait for the right time." the other 2 always tried to convince me to have sex with them, and I did. With Sloan, for some reason I feel 100% happier. I had really bad depression issues in the past, and he is the only person out of anyone I've ever met to make me feeltruly happy.