My best friend who happens to be a male decided it wasn't necessary to tell me about his girlfriend. At first I was disappointed in him because there's flirting from both ends pretty frequently, sometimes we even talk about sex and he always helps me with everything. I always wanted to be more than friends, just never had the courage to tell him. But I've definitely hinted it to him. Anyways, I found out through a mutual friend that he has a girlfriend. When I confronted him, he said he just didn't feel like he needed to talk about it because his relationships end fast and that he says I'm more important than her. I explained to him that I was upset and disappointed in him that he didn't tell me because of how flirty we get so I decided to back down and stop flirting. As the days go by, I can't help but to get jealous because I wanted to be his girlfriend. I don't want to break them up. I need advice.. Is there a better way than to just disappear from his life, or is this the only way?