How do know if your ex is back for a relationship or he just wants sex?

My ex came back love bombing me and saying how much he missed me and how much I mean to him. For first two weeks he was great, we talked everyday, we hang out. One time when we were out, he asked me to take his picture. He told me the picture was for his parents but my gut feeling was telling me the picture was another woman.

Then he stopped texting me back and taking days to return my message.

Now he's out of town and hasn't responded in five days.

He doesn't want a relationship, does he? I am his back up plan for sex, right?

How do know if your ex is back for a relationship or he just wants sex?
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