Do I need closure?

Four years ago I moved out of IL the cost of living was too much for me especially being a single mom of a growing boy and a college student. I moved to NC a few minutes outside of Charlotte I left behind my boyfriend, my childhood sweetheart, who had agreed to leave once I found a place and he got a job offer. I waited for months he kept giving me excuses until I blew up at him one day questioning whether he wanted to be with me or not. Not only did he tell me he was dating someone else but he said we were just friends my soul was crushed. I simply said alright and never called him again.

A few months later I meet my now fiance we hit it off, date, boom boom engaged I’m so happy. Yesterday was the cake testing my fiance is not a fan of sweets but he had something else in mind so he and his mom did their thing while my sister and I tried some samples. As I’m stuffing my face with cake in comes Lorenzo, my ex, he’s cool with my family so one of them told him where I was in NC but they failed to tell him I was getting married he thought my sister was getting married. He found our location on FB when my sister checked in. I always knew that feature was a bad idea anywho he waltz in cool as a cucumber. Busts his bubble when he finds out I’m getting married in two weeks and brings up me waiting for him. We’re having a calm, adult conversation about this but in the middle of it I feel like I’m betraying my fiancé by doing this I step away while my sister also my body guard shoos him away. He got a job offer in Charlotte he was in town to surprise me what kind of shit is that to pull on a woman whose heart you broke and haven’t spoken to in months?!

I’m not having feelings of regret my fiancé is the one for me no doubt but I can’t stop thinking about this crap. My bff says I need closure, my fiancé is leaving it up to me and I just want this to stop bugging me like ugh why do I have all these questions? I know I can’t go into a marriage like this. Please no negative comments my mom already giving me grief.