OLD Friend stuff and being in her wedding but i don't feel like attending?

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I have old friend of mine name Lea whom I knew years and we were close or best friends. However, there has been many issues of the pasts and on and off with me and her. There times I feel i can't stand her habits and that I wonder is this the only friend I have?? Sometimes I even feel is there other friends aside from just her. Just recently when I had been closer to another friend from church, this old friend also came to the picture. She knew I've been closer to the other friend. They also have met through me. They had their own issues before. However, just recently I used to be chilling with my other friend jackie. and sometimes my old friend Lea would hang out with jackie when I'm not around. However, Lea found out I do go to Jackie's often. Now that she knows that, it's been happening that lea wants to hang out and seems I've been hanging out with Lea without jackie around. I did want to hang out Jackie preferrably more than hanging out with Lea because I don't want that issues of me and Lea again. It's always been happening whenever I'm always too close or buddy buddy with Lea so I limit from her once in awhile. Now it seems I can't avoid her much because I end up going library and job searching with her. My concern is also she just invited me to her wedding to be either a guest or bridesmaid but I really don't feel like being part of her wedding at all? Her wedding might be next year. But I told her I don't know about attending it and lots of events may happen around her wedding date. I told her maybe. But deep in me, I really don't want to be part of her wedding at all. I think she can sense that and she kinda guilt tripped me said "I know you don't want to go to my wedding blah blah blah"..So I dunno. then she says she understands but still i guess she might tell people even if they ask because theres some friends of hers that do know that me and her were close friends before.. I also feel if I go to her wedding or be part of her court, that I'll be obliged that she'll be part of my life and something like that. Sorry for my thoughts.. Or that if i be in her wedding then in the near future if I ever have a wedding that I'd have to invite her too. Generally I don't like weddings only if its relatives. I just feel its a burden for me even if she says she gonna pay for a dress. I really don't know anymore. It's like this girl can read my mind or thoughts because of she knows me well when were best friends before. Also I feel yes she's trying to change or is changing but half of me feels I still need to limit her once in awhile. My mom knows about the whole Lea issue thing on and off from the past. Any comments?