Relationship troubles

I’ve gotten myself in a relationship with a guy that has been with many girls in his past (which I found out after we’ve already started dating) and November of 2017 I was told I have an STD (which I obviously got from him) at this point I felt like I had to stay with him because no one else would want me but I’m really tired of the everyday arguing. I’m contemplating on leaving him but it’s hard to walk away. How do you leave someone who gave you an STD knowing that no one else might want to date you?