ruppymom

My ex and I have been divorced for 3 years. I found out, last night, that he is co-sleeping with our youngest child, my 7 yr. old daughter, when the children are at his home. According to my daughter, she falls asleep in her own bed and sometime in the night her father moves her to his bed, where she awakens every morning. I have never suspected anything untoward in his behavior, though he certainly dotes on her far more than he ever did the other two girls, but I can't imagine any rational (or emotionally healthy) reason for his behavior. Am I wrong to be concerned about this?