What is he playing at?

I'm needing some help. A guy from uni who I've slept with a few times has been texting me a lot recently. He added me on facebook after the first time and then consequently asked for my number. Any way the last time I saw and slept with him was about 3 weeks ago. Since then he has been texting regularly. I asked him if he wanted to go for a drink and he said "yeah can do at some point" but then didn't suggest a day that we could meet up. However continued to text me and has done for the last 2 weeks since.

I've also heard through a friend that he messed his ex girlfriend around a bit because of a previous ex and that he has been keeping in contact with her.

I just don't understand why he would continue to text me if he wasn't interested.
What is he playing at?
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