Thank you for the replies, Grace and Snod.
It helps to reafirm my suspicions.

Ex's relationship with daughter comes and goes. Sometimes the relationship is tense, other times it is non-existent, and other times they are buddies. It is never a parent/child relationship though. Ex is not capable of that, plus he wants to be liked so very much that being the disciplinarian would be too hard on him and require too much effort. He is so very afraid of rejection. Plus he banks on me doing all this work so the kids dislike me at times for setting boundaries and rules.

I have let the situation go since my daugter knows how I feel about it and has taken the picture off. It would not help one bit to confront ex. He in fact would love it if I went crazy about it so he could justify why he left the family.

Me: 46 H:44
Together: 25 years
Married: 20 years
Separated: 11-30-06 Divorced 12-21-07
OW: EA began 2005
PA began end of 2006
3 children,20, 16, 6
ex asked for forgiveness
01/16/11