So Sick and Tired of My Husband and His F'n Guilt Trip!?

My husband is pissing me off! He has been going thru this battle of allowing his kids mother to use his 2 oldest kids against him. She hates him and plays yo yo with the kids whenever he doesn't do what she wants when she wants. She has been doing this for 10 yrs now and we have been together for 13 years. So I have watched him get his hopes up about things like her allowing the kids to come live with us and I'll be 100% with him and then she'll go back on her word and not let the kids come I guess she doesn't wanna give up the child support checks she gets...but anyway just recently she allowed one of the kids to live with us and then got made at him because the other daughter thats still at home made a mistake and broke a cabinet and so the kids mother felt like my husband should pay for it and of course he said no so she said bring the other daughter back and he will never be able to see them again...so couple days later she duped him into letting the daughter go home with her telling him that she will let her come back after the weekend....I told him not to let her go no matter what she said because I knew she wasn't going to allow her back and thats exactly what she did. So now its been a week since my stepdaughter has been gone and now my husband feels like he can act like an *** to everybody around him especially me (he does this everytime she pisses him off and then he pretends that isn't the case) He will act very distant to me and our daughter (5yrs old) And then when she allows the kids to come around again he treats us nice and loving like a husband/father is supposed to act but then she dupes him again and the cycle repeats itself.....I AM SO SICK OF IT! and I'm sick of him keep falling for it! I have not voiced this to him at all but its to the pont where i am just tired of him letting her play against this guilt trip he obviously has. He hates her n she hates him n im like Grow Up! I guess i've vented enough what do you guys think? oh yeah n everytime i encourage him to try n get custody(he has some type of limited custody forgot what its called) of the kids he talks a good game but never actually does anything!