I've known a few friends and people. Everyone is so different, but my best friend was bipolar. He was so much fun, kinda like 50 first dates sorta thing. We would go out somewhere and he'd change his mind every ten minutes and walk off. After a while I just got use to not being surprised if he just left all of a sudden, his attention span was like 5 minutes tops, then he'd want to do something completely different.
Stop investigating in people like that. When it comes to love, if there is something I've learned--only give what you get from the other person. Never gift unless you are in a serious relationship. And even if you are in one, have limits. The way I see it now--if people are able to walk talk and stand, they are capable of saying, "how can I take your order".