Which conversation is correct?

Clive

Malina: I don’t know if I should leave my girlfriend for cheating on not me.

Jackson: I would suggest you should leave her. <<<<< OK, but sounds a bit formal.

Thank you so much Clive. But I have a quick question.

Malina: I don’t know if I should leave my girlfriend for cheating on not me.

Jackson: I would suggest/advise you should leave her.

Is there an implied if clause with the use of would? If yes, what is the implied condition? Is it "if you asked me for advice/suggestion..."?