Is this a sign he has someone else?

He didn’t come up when he said he would and was out the night before. He got a new Instagram follower.

Messaged me the next day saying he didn’t do anything but randomly doesn’t trust me, doesn’t think I tell him the truth

Then later on seemed game to sleep with me the following day.

Hee stopped going to the gym at his usual time so makes me think he’s with someone else

And the out of the blue saying I’m paranoid and worried all the time because I’m doing what I ask him if he is.

So the Instagram follower, the lying about going out, ignoring me all the next day because he was “pissed off at me” then saying he doesn’t trust me and thinks I’m doing what I ask him if he is and not going to the gym at the certain time anymore.

Does this seem like he has someone or I’ve overthought. He said he didn’t but also said he didn’t go out
Has someone
Overthought
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Is this a sign he has someone else?
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