sex w. another guy while pregnant

So I think I've found the perfect guy. But I'm 3 months pregnant w. another guy's baby. I get so horny at times but I feel terrible knowing this isn't his child & i wanna have sex with him. I appreciate that I'm pregnant & he still chose me & treats me like a princess. He don't use my pregnancy against me at all. My baby father is america's biggest asshole. But would that be bad to have sex with him even though he isn't the father of my baby? Like would that make me a slut on a higher level?