Help need honest opinions please!!

I wanted to know what are your honest opinions on how do you feel about someone sleeping with a dude who has a baby mama. So I've known this guy since middle school & we've went out & got back together basically off & on. Now we're in highschool together but he told me he has a bm, but he wants to have sex with me. At first I was putting up my guard but I haven't had sex in a while so I eventually had sex with him twice. I feel like the only reason I did it was because I needed it so it was like a win-win. But now I'm starting to feel like a side ho & I refused to be one so Should I cut him off or continue?

*note: he met my dad & come over to chill at my house sometimes & vice versa with me*