He'll start finding anything that he can to complain about. He'll suddenly stop holding any meaningfull conversation with you. If you two were very sexually active you may notice a drop in that. It may eventually drop completely. Im not an expert im just going off what I did to a couple of girlfriends.
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He gets to where he stops calling so much. Wants to hang with his friends on week nights. Sometimes he acts irritated when you ask him a simple question. He is not as affectionate as he use to be. Find a new boyfriend, I'm afraid that you're not going to be together long.
Trying to change yourself is almost always a waste of time & effort.
if he only calls u after 11 pm. The reason is u have shifted from being an EX to being a BOOTYCALL. No feelings or strings attached.
I think you sort of know, - the fact that you are wondering about this is probably an indication that this may be the case.
If a guy doesn't have feelings for you and you have feelings for him, just be friends. Maybe if he gets to know you, he may start to have feelings for you.