Why can't I be friends with my bestfriend even if he has a girlfriend?

ChelseaMarie2011
I've been friends with this guy for over 6 years. We were bestfriends, I told him everything and I trusted him soo much. I did have feelings for him but he never knew or returned the feelings so I got over it. About 2 years ago he started dating this girl who wasn't a good friend of mine but I knew her and we didn't hate each other. But for some reason our relationship changed, he stopped hanging out with me or he'd make plans with me and then ditch me, we stopped talking, and then we started fighting. I remember one time in particular I called him because he had ditched me and he starting saying some horrible things to me about how I didn't care about him, which was the biggest lie ever, and I started crying and told him that I hated his girlfriend. It had slipped out but I didn't really regret it because at least he knew how I felt. After that our relationship got a little better. He made the effort to hang out with me, and his girlfriend wamred up too, telling me that she never wanted him to stop talking or hanging out with me. That was about a year ago, and in the past year we barely talked, I didn't even consider him my friend, and I made the mistake of telling our mutual friend that and she went and told him. So his girlfriend confronted me asking me why I didn't want to be friends with him anymore and I told her and she had the nerve of accusing me of having feelings for him simply because I cared about him and his life. I got pissed and we kind of got into a fight but we got over it, and me and him became sort of friends again. But over the past weekend I found out that his girlfriend has always had a problem with me and him hanging out and being friends which made me really really mad because I never did ANYTHING to make her not trust me. ANd I guess that she never trusted me but she lied to me face telling me that she told him to still be my friend which caused fights between me and him . I just don't get why she couldn't be up front with me. But my biggest question is why can't I be friends with him if he has a girlfriend? I just don't get it.
Why can't I be friends with my bestfriend even if he has a girlfriend?
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