^ Hey welcome to SPW, MtBikeDude. (Mountain biking, awesome.)
It took me a while to figure this out, but as the years rolled by, and it became a pattern for me to break up with my boyfriend about 18 months in, I had to start asking myself what the common factor in these breakups was, and of course it was me.
I think it's because I find it so exhausting trying to be what I think he wants me to be, that the stress and weariness become this huge weight bearing me down, and I crumble.
(True also of platonic friendships, if to a lesser extent.)