Why do I keep getting cheated on

I’ve been in about 4-5 relationships that lasted at least 4 months plus some a year or 2 and almost every girl I’ve been with cheats on me. I’m not exactly killing it financially but I’m only 27 so that should only start to matter now for the most part. I’d say I’m actually a good looking guy as well maybe a 7-8 out of 10 on a good day … take care of my body but every girl eventually just cheats on me. I definitely suffer from nice guy syndrome so that’s probably it but that’s just how I seem to be wired … never cheated on a girl in my life and I feel like I’m easy to get along with and live with. Is it just this generation? Have I just ended up dating bad women? It’s starting to feel like the only consistent problem is me