Boys exposed to husband's girlfriend before divorce final

My soon-to-be Ex husband is constantly bringing our 2 boys, 4 & 6 yrs old around his girlfriend (with and with out her 2 girls 4 & 7 yrs ). My husband still lives in our house with us and our divorce will not be final at least for 3 more months. The boys have said they feel daddy spends more time with the girls then with them. He rarely has any time alone with his boys. I'm afraid he is making a big mistake by exposing the kids to his relationship, and he thinks i'm over-reacting. Am I?

It is terrible for the ex-wife and her children when the husband meets a new girlfriend. She will now be the person in power and the needs of the old family will be constantly neglected.

Read more about children and stepmothers.