Why did he stop calling me?

I know this is the complete opossite to what dating without drama tells you to do.

I met a guy at university around 5 years ago, we were friends nothing more. When we finished university we went our own ways in finding jobs and moved to different cities. that happened around 2 years ago.

recently he requested me as a friend on facebook, we started chatting a lot and catching up on our adventures for the past two years. We realised we had lots in common.
Then we exchanged phone numbers and started chatting all the time, we flirted with each other a lot. I asked him if he had a girlfriend and he said no, but he had gone on 5 dates with a girl but she had gone away for 3 months so he doesnt know what will happen when she comes back.
This eventually led to him coming over by my house and from one thing to another we ended up sleeping together.

I know this is wrong according to the dating without drama book and i should not have done it.

When he left he texted me every hour to say he really enjoyed sleeping with me and look forward to do it again. But then he had some guilt within himself because he has made a semi commitment to the other girl.
I said to him that he is not committed to any of us and should really take it easy and think about what he really wants from a relationship.
I also told him that what we did was wrong but life is too short and we can only move on and forget the past,we all made mistakes and if we were to start dating then we would do it properly. but also told him that he needs to decide if he wants to date me or not.
He then replied and said that it was early days with this girl and would like to give it a try.
After that we kept sending messages a bit flirty but i was taken aback by what he said before so just told him you know where to find me...to imply if he thinks about who he wants to date and comes to a conclusion he can contact me, but he did not reply.

LAter on i texted him to ask him if he had a good time at work and finally ready to roll on the weekend. but he did not reply.

I dont know what to do now. Should I contact him or just leave him and let him decide what he wants to do.
Am really missing not getting his text messages everyday, and now it seems that i have allowed a man to use me.