Honest Opinions Please.

So Im 16, going into junior year of highschool. I am currently in a relationship that i was in for a year and about 10 months straight. I messed up and we broke up for a while and we just recently got back together. It’ll be 2 years in september. When we were apart, we were both seeing other people. A girl he was talking to while we were broken up wont stop obsessing over him and its annoying. He told me dont let it get to me but it does, only because the girl goes out her way to be petty. I asked him to text her and clear up the fact that they dont talk anymore or I’ll do it myself. He got mad and said it’s not that deep.. was i wrong for saying what i said ?