I met this guy at work and he started to flirt with me and I flirted back I didn't know he had a girl until I was talking to her and told me they have been together for two years she also works with me. Now he kept flirting and I kept flirting with him until we exchanged numbers and I ended up sleeping with him. My problem is I don't have any feelings for him to me its lust but recently he has talked to me about breaking up with his girl and taking me to his parents house and if I get mad at him he gets all sentimental now I don't know what to do I have not texted him or called him or seen him outside of work because frankly I don't like him like that but he keeps texting me and trying to get me to out with him while at work. What should I do?

If you dig your hole you have to climb out of it.

First off I am glad you are not thinking about a relationship with him because if he cheated on her, he would certainly cheat on you.

Chalk it up to having a good time and be on your way. And stop returning his texts.