Having a hard time with my boyfriend being "friends" with his ex?

[Sarah]

My boyfriend and I have known each other for 10 years and have been together since January of this year. We moved in together in June. We get along amazingly for the most part but he is still friends with his ex that he lived with for the past 6 years. I have asked him to please stop talking to her but he is constantly posting things on her facebook page and talking to her on messenger on FB. Last week he posted a .gif from an episode of 30 Rock from an episode entitled "Let's stay together" and it was a clip called "Jenna Maroney, Master of seduction" and has the female wrapping her leg around a guys shoulder. About a month ago when I was at work, my mother went by my house to drop something off and caught the ex g/f in my house with him. When I questioned him about it he said that she came by to see the dog they used to have together (who now lives with us). I'm not buying that. My mom sat outside the house to make sure she left and she called me a few minutes later telling me they left together with the dog. He never would tell me where they went other than "to walk the dog". He says that I am trying to be controlling in telling him who he can and can't be friends with, but I don't think he needs to be talking to his ex. Am I wrong? I don't talk to any of my ex's. Another thing is he is currently unemployed and I work 12 hour night shifts, so I am paying for everything. she also recently changed her facebook profile picture to their dog, who as I said now lives with me. I feel like something is up or either she is trying to piss me off. Am I in the wrong here in this situation? Is he being shady and do I have the right to be suspicious about him talking to her, or am I really controlling? What do you people think about my situation?

[Alliwannaberight]

This sounds awful. At first I was going to tell you it is possible for a guy to be friends with his ex- but the reality is- it hardly seems necessary. I mean yeah, it's nice to catch up like once or twice a year- but even that is a little fishy. I am "friends" with my ex- because we have a 3 year old together. His girlfriend hates if we talk about anything other than our daughter, and I understand. What she doesn't get is that I don't want him at all, and I don't know if he wants me or not but we don't talk about that stuff. He's actually given me advice on my current relationship. But what you have going on is terrible. I would get out of that crap immediately. That guy sounds disrespectful to you and unable to let go of her. You're better off not having to live with that stuff, for real and seriously.