First off, daddy issues is just a shitty way to say you were either emotionally abused or neglected by a father figure. Google childhood emotional neglect and attachment style as that will give you a more empathetic way to think about what you went through.

Second, google fawn trauma response, as that often explains why women get involved sexually when they don’t want to. People acting like it’s just to seek validation, sure that’s part of it, but if you don’t want it but do it anyway that more likely is a fawn trauma response.

As for cheating, sure it was the wrong choice, but often when you’re being emotionally neglected or abused and it’s hard to get the confidence to leave, cheating helped you do that. Since it sounds like your current partner isn’t abusing or neglecting you, I doubt you’ll cheat. But if you do feel tempted, before you do, check in with yourself, are you being neglected or abused, is that why you’re seeking attention elsewhere. Or are you bored, or does cheating help you feel better about yourself. Figure out the emotional need behind the cheating and find a better way to address that need, and you’ll avoid cheating and feel better about yourself in the process.