So when I was with my Ex we did stuff like oral sex and he would touch me. We never had sex and I had never had any sexual contact before him. But when we broke up and before we got back together he has sex with another lass. This lass was apparently a virgin and he said that he didn't think she had done anything with another guy before.

What's my likelihood of catching something from him?

BTW it's been 10 months since we broke up and hence 10 months since I have done anything with anyone