Don't ever invite him to anything ever again. He has shown what is important to him.
I can relate. For DD's 1st birthday, back when IL's were still speaking to me, THEY had a 1st b-day party for DD. The party started at 2pm. XWH said he would be there. I then found out from his co-worker that he was going to a wedding 2 hours away that same day, so I was ready for him to either:
1.) back out
2.) leave the party early.
That morning, he texts me saying that he was so sick of my behavior that he wasn't going to come to DD's party, (that HIS family was putting on) and that it was MY FAULT!
I was like "Really? Have fun at the wedding tonight!" He was like "huh?". But I knew, and he knew that I knew.
Then, I told his family, at the party, "did you know that he is going to a wedding in the southern tier tonight with the OW?" Needless to say, they did NOT know that. They were horrified. And I wasn't lying, I had details, when where, what time, etc. and they knew it.
After that, they all stopped talking to me. THEIR son/brother/cousin chooses a wedding with the OW over his DD's 1st b-day party, and they stop talking to ME. It makes no sense. But maybe it's easier for them to stick their heads in the sand and not have to face the truth about their son/brother/cousin.
But it taught me one thing, and that was that I can NOT play nice with him, and that obviously DD was not a priority to him, and that put an end to me involving him in any more than I legally have to.
[This message edited by sparkysable at 9:28 AM, October 2nd (Wednesday)]