Hi Perla,
He may have told you off the top not to get emotionally wrapped up because he thought that this was what he wanted at the time.
However, as time has gone on, your affair or situationship with him has evolved into something that he wasn’t anticipating.
In telling you that he felt used by you, he may have been indicating that he didn’t like the fact that you have remained emotionally unattached to him.
There may be a part of him that wants to know that you feel something for him.
Again, his mindset may have changed from how it was at the very beginning of your situationship with him.
He may have even been hoping that you would be the one who would become emotionally wrapped up in him so that he would have an excuse down the road to end the affair with you.
However, it appears to be him that has developed some feelings for you.
He thought that he could do just sex but he can’t.
This is most likely why he said that he couldn’t do it anymore when you ended the affair with him.