You are divorced. Not nice, but it is the fact. He can have whatever pics he wants in his car! And it sounds like they were not something he was gazing at every day! A reaction like that is going to sabotage the good stuff you are doing! You can't let that happen!
OK, no more accusing him of being sour, either! If he wants to be sour, you have to let him! You can't stop it, and for now you need to let it roll off of your back. In his mind the only thing he owes you is civil coparenting. Getting back together is your goal, not his.
If you can show him that you can be the someone he can find, then it can become his goal. I don't think beating him up, and talking about his sour attitude is going to get you there, do you? I still think you can do this, but you need to consider what your goal is, and how everything that you do can either bring you closer to the goal, or move it away.
