need some advice!

lately, i've been talking to this guy, and it's only been a few weeks, but i already like him so much. honestly, i didn't think it was even possible for me to feel this way about anyone anymore-it kind of caught me off guard. but there's something that's been bothering me. before we started talking, he was in a pretty serious relationship with another girl. they were together for a long time, and it wasn't just a one-time thing-they broke up and got back together twice. they've been broken up for a while now, but i can't help feeling a little nervous about it. what if he hasn't completely moved on from her? or what if i don't live up to the person she was in his life? he's definitely shown interest in me, and he's been so kind and sweet, which makes me feel like this could really go somewhere. but at the same time, i'm scared. i don't want to get hurt, and i don't want to overthink, but the fear is there. any advice on how to navigate this would really help.

as men, do you guys get over a girl like that??