So its tough to get rejected on approach, tougher to get to know a girl and get rejected, but now I've just experienced the third. Getting the girl, dating her for a year and a half and than getting dumped. I dont think I was being an AFC during the relationship, most of the time she wanted to text, call, hang with me. I wanted to hang with her too, what I mean is that she just seemed "more" into it.
After about 16 months we started fighting more often, but I dont think I changed. I think she had a short fuse with me, so the change was already there. Ultimately she told me she loved me more than anything at a point, but that she does not feel the same way anymore. This sucks, but going forward is my question...
How do I know this wont happen again? Meaning that my next LTR wont end with the girl not "feeling the same way" even if I haven't changed? I guess I just feel like she really knew me, liked me, loved me, and then changed her mind (which led to the fighting and the breakup imo). My confidence is shot, not to get another girl, but not to lose her without a reason why.
P.S. there is no other guy, that much I know.

bump. please

No relationship is ever going to be guaranteed... There's nothing you can do to keep someone with you if they decide that it's over. AFC, PUA or otherwise.

You will never ever know going in if a relationship is going to last for the long haul.