Is losing it with your ex a good idea?

I was recently contacted by my ex-boyfriend who i went out for 4 years and haven’t heard from since 2 years. We were very much in love while we were in a relationship and even after we broke up, we never stopped loving each other. We had to break up because of family reasons, and now we both want to lose it with each other as we didnt get the chance to do it when we were together. But, he doesn’t want to get into a committed relationship anymore as he is scared because after our last break up, we both went through hell. I’m having mixed feelings about whether i want a relationship too. I’m scared whether i will get attached to him more than I already am. Would it be next to impossible after that to get over him? oh yea.. we don’t have a future with each other because our families have issues with each other. So reply!!