Sex with the ex! Was that a mistake!?

from NoraDevot

I'm still in good contact with my ex-boyfriend Tim. We've been apart for a while, we still write and get on well. He asks if I'd like to go for a coffee with him again. Yes, why not, I think. Two days later we're sitting in a café. He looks really good! We're talking and can't take our eyes off each other. "You look beautiful! I really enjoyed the time with you back then!" Embarrassed, I look away: "I like to think back to that too..." I know what he's alluding to, our sex back then was just indescribably hot! When I think about it now, I immediately start to want him again! He seems to feel the same way... he's practically undressing me with his looks! "Would you like to come to my place?" Before I can think about it, the words are already out of my mouth. He just grins and we walk together to my shared apartment. As soon as we arrive, we pounce on each other. Wow, the sex was really as hot as I remembered it! He still knows what I like! Even though it was really cool, I shouldn't have gotten involved in it! Since then he's been calling constantly and wants to see me. We said it was a one-time thing! What do I do now?