Been a lurker on TRP for a while. Since I've never had anything new to add there has been no point in me starting new threads. Let me briefly say that that I fondly believe in TRP but I have across a family issue to which I need advice.

My Parents have been married for 30 years and my Dad has recently learned that my mom was cheating on him. This began happening as my father went through financial difficulties. She has apologized profusely and wants to keep the marriage. It is no secret that in those 30 years my father has somewhat let himself go ie: gaining weight, becoming too submissive to my mom etc. I have told him that cheating is the last step and that he must divorce her, however there is a deeper issue here. If he does divorce her I honestly don't see him changing for the better and meeting new women. All I can see happening is him becoming depressed. So here is my question.

Is it better that he stay married to her? In other words is this the lesser of two evils? Any advice is appreciated