I know I'm fairly new to this site but I really need to vent tonight...

My husband and I just had a HUGE fight over the same problem that we have fought over for the past 3 years of our relationship. He will "set boundaries" with BM and then go back and do the opposite because it's "for the kids". I am so tired of hearing, "for the kids" that I could just puke. The details aren't super important but I was wondering does anyone else have any suggestions on how to deal with going back on boundaries?