When a woman calls a man a cheat, she may have the following true meanings:

If you feel that a man is not trustworthy: If If a man promises something but fails to deliver, or breaks his promise on some things, a woman may describe him as a "cheap".

Thinking that men are being clever or dishonest: If a man deliberately cheats on something or uses unfair means, women may think that he is cheating.

Feeling that a man is a little willful or naughty in some aspects: This statement may contain a certain degree of intimacy or joking, implying that a man behaves like a child in certain situations.