sex with ex’s?

i have been in two relationships recently. the first seemed to only want to get off and have sex. although we only fucked once (a week after starting to date), almost every day i would give him head and it made me feel a bit like an animal. the second relationship was with a guy who had no experience but even then, we had sex very early on ( about 2 weeks in) and then did every week until we broke up in under two months but still agreeing to be fwb even tho he doesn’t know how to do anything. the same week i went back to the ex and gave him head in the boys bathrooms and agreed to be fwb with him too. i feel like i better than this and the first one is definitely using me but idk what’s inclining me to carry on. what do i do?