I have a very similar issue. Got rather close with someone over the course of about half a year (essentially talking near constantly for like 4-8 hours EVERY DAY) and had to cut it off. It was for the best, but I miss them and think about them often, even though they weren't a good person. I think that probably says more about me than it does about them, though. Either way, I feel you, OP. You're definitely not alone in experiencing this sort of thing.