Bitterness in a relationship

I came to realise that I can't handle relationships that well. Especially BGRs. I am bitter in facing rejection but I am slowly coming to terms to it. It is better to have friends than to have a boy friend who have never once loved me. I am emotionally drained out because I like this guy back in secondary school. But I regret confessing to him and breaking his relationship with his girlfriend. But the thing my classmate like her a lot, which till now I still cannot understand when he has a more beautiful girl hankering after him. But because of that, I lost his friendship, which is not worthwhile. But I really wanted love but I cannot find. I remember confessing to the guy that I like a lot in the romantic way but never really being too aggressive. But the thing, I still loved him a lot. I am hurting right now. But how do I stop the hurt?