Obsessing about others opinions

I’m having a hard time quieting my brain. I’m completely worried with what other people think of me. Here’s the back story, basically I was in a long distance relationship for a year. With a guy I was head over heels for and gave my all to. Anyway he said he wanted to move, so many times and was serious. SO I found a house, roommates and committed to it all and two weeks after he said he lied and was people pleasing and didn’t want to move anymore. The last two months of our relationship I felt more like a possession than like he actually wanted to be with me for me. The relationship ended and I moved on pretty quickly. I grieved majority of the relationship in the relationship. And started dating one of my good friends. We’ve been together for about a month now and I’ve never been so happy. But today one of my ex’s friends commented on our photo on Facebook and said “ew” then started this whole thing calling me a cheater and that I “dropped my ex like a hot tamale” anyway, I’m just having such a hard time with the fact that people actually think that about me. I feel like this always happens where I decide I deserve better and leave the relationship then I’m labeled the “bad guy”, “the Whore”, the “cheater”. I know I shouldn’t care because the people who know me, know that I didn’t cheat and that I did right by everything. And yet im still concerned with people who aren’t even important in my heart.