how do you know

i met this guy, and we’ve been dating for a while now. but since the beginning he’s made it really clear that he had big feelings for me. “i love you” 2 weeks later. but i know in my head he’s not good for me. they say you go after people who remind you of your parents, and he reminds me so much of my father. and my father wasn’t a very good father at all. i’ve tried to break up with him 3 times now but he still fights to stay and i have no idea why. i like to be with him because we always laugh and life is easy. but it makes me want to withdrawal with how fast he’s moving things in our relationship. another part of me wonders if i actually like him or if i just gave attachment issues. he’s told me he wants marriage with me, kids, and a life together. but he’s leaving for a year and he’s also my first boyfriend. he also knows i was more of a hookup then remain friends type of girl. do i wait a year for him or how do i break up with him when the time comes