Fear of being cheated on

I'm single and I've only had one brief relationship (it ended because he was on dating apps and made it clear he had interests on other girls) but I have this overwhelming fear that if I get in a relationship with someone they're gonna cheat on me. It's irrational I know because I know not everyone does it. But the amount of people I've heard of or have known or even guys who've "slid in my dms" and they have gfs. It's ridiculous but I don't know how to get rid of this fear. Especially when all I see on eve is all the girls who've found their bfs/husband's cheating on them. My heart breaks for them and it's made me extremely cautious. Do I need therapy? I'm insecure as it is. I'm 22 and would like to find someone but this fear prevents me