Time for an Introduction...and Thanks

[figure-it-out]

Week 3 of not seeing H. I remained upstairs when he came to get S yesterday and today when he dropped him off. S did return with a new skateboard however and D was given some $$ before he left. He stayed all of about 5 minutes.

I know I would miss out on "real" life with them if I was able to act like he was but it makes me so angry he thinks the $$ and things will ease his conscience. I don't know, maybe it does. He's able to swoop in once a week like santa with gifts and money never bothering to worry about the other days of the week. The homework, practices, doctor appointments, etc. Then return to his 20 something year old GF who I'm sure thinks he's just the best dad ever.Ugggg.

I'm starting to question my reasoning for pretty much having nothing to do with him these past weeks and could use some advice. Initially after finding out he took S to his new place and then the following weekend introduced him to GF I was just so disgusted and angry I didn't want to see him and say anything I would later regret. I am now wondering if I am just doing it to punish H. He's given no indication other than the text last Sat. that he's even noticed ("are you mad at me is that why you weren't here when I got here").
Prior to this we were getting along really well. I was somewhat irritated he would decide on HIS whim to stay at the house rather than take S to his mother's house prior to the big introduction with GF. But when he did we had a great time as a family. He would communicate with me if he was unable to take S to practice during the week. The past 2 weeks he's just not showed up.
What would you all do?
Am I feeling this way because I just want to have any interaction with H he sees fit to give or am I ruining the bit of good interaction we had? I don't want him to think here's the same old FIO, punishing me like a child. I'm trying to figure out how to protect myself without pushing him away farther without letting him have his cake and eat it to. Darn this whole process is madness! Thank you for any words of wisdom you might have!