Would u stay with a man that got paid to get his d sucked?

So we were together for several years very young into our early 20’s. When we ended up getting our own place after an argument he ended up staying at his moms house & come to find out he got paid by an old man to suck his dick... idk if that’s all what happened.

During this time my period was off, I kept complaining about a smell I had & bad pain that felt like cramps I asked him if he slept with anyone & to tell me cus it could be a STD. He swore up and down he didn’t. Few months go by we move into another apartment & I asked him after crying in a ball bc I was in so much pain he still denies it and the next day tells me after hounding him about it. I was so disgusted and stopped having sex with him completely & he has recently left our apartment. My question now is why have I become so normal with this behavior...? I was so disgusted and mad at first now Simce he’s gone I’m always concerned what he’s doing when I shouldn’t give a fuck!!!! It’s like what he did doesn’t bother me anymore...? I come to accept it... idkk.. idk if this is just loneliness speaking idk if this is because I was with him for so long he’s all I know I’m not sure 😞 but I shouldn’t be okay with this at all and I wasn’t that’s why we stopped having sex... now he’s gone it’s like I’m forgetting about it to ge with him..