Is this parental alienation?

[Tartersauce]

Your son has two families now. One with the ex and one with you. There's no need or point to do things together. There's no reason to look to your ex to create memories between you and your child. If this is the way you've been pushing things, to do them "as a family," the ex has every right to keep this kind of information from you.

Although - and I think you would get a better result if you approached it from this vantage point - your son does DESERVE to have both of his parents there rooting for him. I have a feeling that if you don't make it about you being left out, there won't be a problem.

Find things to do together with your son. Take your income tax refund and take him to Disney World or buy season passes to the nearest theme park or other fun place. Get active in your son's life in a way that you enjoy. That way, you won't be as worried or as hurt over what your ex is doing with him.

Good luck!