13 year old ex tryna hook up

I broke up with my ex bf last year. I was 14 at that time and he was 12. I broke up with him bc of our communication and plus I wasn’t allowed to date and I was scared of getting caught with him. But when we together I was and still is very comfortable with him on a sexual level. Not to mention I was his first kiss! Now almost a year later we still keep in contact and text each other all the time and I still have a little bit of feelings for him and we have good conversations in person not when texting ( that’s why I broke up with him last time .... communication sucked) but now we aren’t together but we are really close and he wants to get sexual. He knows I’m saving myself for marriage but he knows I’ll do other stuff. And a part of me wants to do stuff with him bc of my trust sand how comfortable I am with him. What should I do?? Should I just go with it?