You tried a trial marriage and you quickly found out that you're unable to maintain a happy, healthy, functional relationship. That's what dating is about to find out if who you are compatible enough to last the test of time. You guys apparently are not.
Can I ask why you would have unprotected sex with him when you knew he had an STD? Did your research not indicate to you that your chances of contacting it were high. You probably were exposed to it prior to getting vaccinated.
Don't go back just because you're feeling lonely and are afraid to be in other relationships now. That is a recipe for disasterous unhappiness for both of you.
Do more research. This isn't the end of the world for you.
That's my motherly advice.
He didn't answer you. So get some councelling to help you to come to terms with what you have and to help you get over him. Don't contact him again. He knows how to reach you and if he ever does again, you both should get some couples councelling together if you're going to try this again.
Hugs
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion