Intimacy help!

Hey everyone I need some advice about my situation. I recently got in contact with one of my old best friends/boyfriend. Our history is very complicated. We started dating after my long term bf and I broke up, we lasted for awhile and I got scared of hurting him so I ended it and eventually got back with my ex. That obviously caused a lot of tension and problems and we drifted apart. We got back in touch couple years later and started hooking up, I got overwhelmed and scared and stopped talking to him again. Couple years later again is the third time we have been in touch now but I'm having so many questions that I'm not ready to ask him personally. It's been couple months that we have been seeing each other. We are hooking up all night and it's absolutely amazing. The connection and friendship we had felt like it never faded,the only part I'm constantly overthinking is that he hasn't kissed me yet? Every time we are hooking up we are all over each other and kissing our entire bodies but when I get to close to his face he seems to turn away. After all this time seeing each other I would think he would at least try. Is it because of our past, is he scared? I have no idea what it means.