My fiance and I have been dating for almost 2 years and are recently engaged. We started dating very soon after he separated from his ex-wife and she believes that we had an affair. She has been relatively amicable with him to date following the divorce but with the announcement of our engagement has quickly become angry and uncooperative. We're doing our best to remain as we have in the past and to shield his 4-yr-old son from any discord. He's a great kid who has openly accepted me and loves spending time with us (We've been living together for over a year, so nothing aside from my last name will really change for him). But I could use some advice on how to explain marriage and divorce to him. His mother has been showing him wedding pictures from her wedding to his father and he is very confused. We want to explain to him about love and marriage and divorce without overtly contradicting her or confusing him even more and at 4, there is only so much that he can understand. Has any one been in a similar situation? Any advice? We're desperate to keep the peace and continue our focus on raising a happy and healthy little boy who is doubly loved by 2 households, I could use some advice and support from others who have been there.

Thanks!!