Why did he want to get back together if he’s not interested?

I got back with my ex boyfriend because we missed each other and both him and I wanted to give it another try.
The problem is, when we are together, everything is great. He acts interested and into me and we can’t get enough of each other.
However, when we are apart during the week, I can barely get him to talk to me.
Scheduling dates is a pain too because he either waits for me to say something or completely ignores the fact that it’s the weekend and we both have time to go out.

I’m beginning to think he’s not interested.
why did he want to get back together if he acts so hot and cold?

Why did he want to get back together if he’s not interested?
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