Dated a guy 7 years ago.. can’t get him off my mind to this day.. should I just send him a damn message?

I dated a guy 7 years ago, we dated for 6 months.. awesome relationship. However, it was long distance and he broke up w/me which I still don’t know y. He seen me at the park once (3yrs later) w/my daughters, he stopped, talked, got my number and texted me a few times wanting to hang out which I did not cuz I was in a relationship. I still am w/the same guy I’ve bn w/since this ex-guy I dated (somewhat of a relationship) but there is nothing there anymore.. we haven’t even been intimate in 6 years.. we do our own thing we’re just comfortable where we’re at. And that’s just how it is. Anyway, this ex of mine, I cannot get off my mind, I feel like we were perfect for each other and I feel like I should just send him a fb message letting him kno how I feel.. the only thing stopping me is becuz his fb says he’s “in a relationship”.. n I don’t want to come between that.. but then I think that mine says that too but really I’m not in a relationship.. my “bf” n I bypass each other on our way to work once a week If tht, don’t talk, we live on the same property in 2 different houses.. (again, we’re just too comfortable where we’re at).. so tht label on fb doesn’t always mean that.. I use to put tht just for several reasons. Would you, if yr reading this, send a message to yr ex letting them know to this day, 7 years later.. that you still think of them, and your time together and leave the ball in their court as to the next move? And guys.. how would u feel/respond being in his position & getting a message from an ex girlfriend in regards to this? With or without being in a current relationship (if his fb relationship status is true & he is indeed in a relationship)? I truly do but know what to do.. n I don’t want to regret not ever saying anything but than I don’t want to regret saying anything lol I’m not a homewrecker.. & that’s why I’m struggling soo bad but my feelings are so strong that I feel I need to let him know and leave the next move up to him.. thoughts?
Dated a guy 7 years ago.. can’t get him off my mind to this day.. should I just send him a damn message?
Post Opinion