Three years later..he wants to meet.

Anyone have a situation where you and your LO end up splitting? Not seeing each other for months, years at a time? My boyfriend/bd of my 14 month old, he hasn't seen or met our son. He doesn't even know we have a son.. he knew I was pregnant and came to my first ultrasound appointment, came with me to the hospital when morning sickness kicked my ass, and after 6 weeks, we got into a huge argument and I haven't seen or talked to him in almost 3 years now.. He messaged me today asking to meet up.. we live in separate states and he's always been the love of my life. I have no eyes for anyone else. Has anyone had similar situation? How did it go? Any advice on coparenting or rekindling old love? Tricks you use for better communication in a relationship?