I'm not having fun. I play pretendyfuntime games to have fun. I have very limited time, so if I'm not having fun I don't do that thing anymore, and do something else.
If I dread logging in or it's work, it's no longer fun. If a person blows me off, it's no longer fun. They may not have done so, but if it feels it that might be enough, depending on the person; if I've known them a while I might talk to them about it, if it's a new relationship maybe not.