am I wrong or just over reacting

Kimberlynn
So my son's father who barely see him or checks up on him filed for joint custody behind my back. I'm pissed that he did that. He goes 3-4 weeks with out asking about him. But he goes and puts on a front for Facebook saying he misses Declan but doesn't try to ask about him ir try to see him. When i ask him if he wants to get him for the day he makes excuses. Or he gets mad cause me and Declan have plans to be out of town that have been established for months saying that I'm keeping him away from him. We're both currently active duty military. Ever since he got back from deployment Declan has probably seen him maybe 6 times his whole life. His dad is currently getting ready to go to Texas on new orders. Am I wrong for getting mad or am I just over reacting?