A real litmus test for me is how people treat someone who is waiting on them. That's a dealbreaker for me. If I were on the verge of getting into a serious relationship and I saw that person be mean to a waiter. . . I'm out.
I'd have a few on and off, but the commitment was always more on the girls' part than on mine, to be perfectly honest. So, I met a girl in Tokyo, on my Japanese tour, with whom I've been living ever since, very happily. Her name is Suchi.