Exactly.

But cheaters aren't communicating honestly. They are keeping secrets (not communicating), lying, and deceiving (communicating things that aren't true). Yet, expect that their partners keep trusting them.

To put an example that has nothing to do with cheating. I once had a boyfriend that when he didn't want to do something, lied about it. For example, if he didn't want to go out with friends, he would say that he asked and they didn't want to go out. But I caught him lying because I talked with those friends and learned that he never asked them. There were more lies like that. As a result, I stopped believing what he said. And break up because I couldn't trust him. that could have been avoided by saying that "he didn't want to do something". Sure, we would have had to negotiate and compromise, but I would have kept trusting his word.

Similar things happen to cheaters. They tell you lies to cover for their cheating. Eventually, you stop trusting them. Or stop counting on them, since you know they won't be there if needed.