I'm sure this has been asked about before but I couldn't find it. My friend and I have had an on again/ off again friendship for 13 years. We drift close and apart but I still care about her a lot and when we were close I had always planned on having her in my wedding party. The problem is, the more stable my life becomes, the more we seem to drift. Since I started dating my FI she's wanted to hang out less and less, even when I go out of my way to try to make plans with her. She even missed my last birthday even when promising that she would come to it.
About a month after I got engaged she's been making more of an effort to spend time with me and took me out to make up for my birthday. I had already decided on 5 other friends (2 of which are my FI's sisters) for my party. I know that this friend is expecting to get asked but as I've had to deal with other flakey BM as a BM I don't know if I trust her to live up to the duties that BMs are going to. I also don't want to ask her only to drift even further apart though that's almost sure to happen if I don't ask her.
I don't want to lose a friendship, but I also don't want to add extra stress to the more reliable BMs. Any advice?
