I'm wondering if I am non-romantic because of my difficulties to emotionally connect with people and replicate the same kind of romantic attachment they feel for me. I had what I thought was a crush on a guy in college that went on for months, butterflies in stomach whenever I saw him, etc., but when we actually started dating (my first relationship), I wasn't turned on by any intimate activities other than holding hands. Eventually I felt like I was just obsessed with him, and liked being around him (he was really interesting aesthetically and personality-wise), he broke up with me after a couple weeks because it was too much for him.
Second relationship was a year long and I felt like I just couldn't maintain emotional feelings for him, when we were apart and he wasn't immediately physically present I just forgot about him. He grew more attached to me and said he saw our love deepening ("absence makes the heart grow fonder") - I ended it because I didn't feel anything and thought it wasn't fair for him.
Third relationship which ended recently, also about a year long, same story as second, I started to not to feel anything and felt bad that I was leading her on.
I just feel like in general I can't sustain "romantic" attraction to people (I already identify I asexual) and am trying to figure out if the attractions I feel toward people are romantic or platonic or something else. I want to be close with people and hold hands, and maybe be very committed to each other in the sense of a strong supportive bond, but I don't know if this is necessarily romantic. I guess the closest word for it would be a bromance.