This is a persistent problem I've had in my life and I wonder if any of other other INFJs can sympathize.
I have this really weird habit of starting to care about guys MORE the longer I'm away from them rather than less. It's happened several times that I've dated a guy for a couple of months during which I wasn't super-excited about the relationship, but then either I end it or they do, and during the month or two after the breakup (during which time we're not talking), I get sad and fantasize about getting back together with them.
This happens with guys I'm actually dating, too. I'll be hanging out with them and will just be "eh" about them, but then if I go without seeing them for a week, I'll be missing them and convinced I like them a lot more than I actually do, and then when I see them again, I'm reminded that I'm not actually all that interested in them.
I have no idea why I do this. Does anyone else have this happen to them? Honestly, it's almost like guys seem a lot more "perfect" when they aren't actually around!