Overreacting?

I’m just needing to really vent and see what others think... sooo I’ve been with this guy for two years, we have a 10 month old precious babygirl together and two kids from separate relationships. Recently he has been on this “tik tok” trend and I only recently found out you can actually send messages on this app... I know late learner here lol but anyways not only that I have found he was messaging a friend on messenger. According to him he sees no harm in what was talked about due to the fact she was the sister of a buddy of his in his Motorcycle club... they swapped selfies and was talking about meeting up for lunch? So am I overreacting when I stumbled across this and got mad not only because he was messaging a girl but because he made me delete all my social media due to the friends I had on there... I’m pretty sure I know the answer but just need a little reassurance that I’m not just psychotic lol