My ex is back

So my ex is back, but he seems different more mature now. We dated when we were young and now we are older and we reconnected recently. We did go on little dates,but I can already tell that there is sexual attraction there. I don’t want to give it to him fast. How long should I wait ? Ps: he was my first and the love of my life. Idk what to do it is so weird how we reconnected now.