My friends husband is a psycho...what should i do?

My friend is a big biacch w/ her husband, she cooks, cleans and all thar good wifey stuff but she constantly puts him down. She degrades him and makes him do everything for her when they are out. Short example: he will be with the guys bbq n she will yell for him to make the baby a bottle but i mean yell n snap her fingers.... The guys started loosing respect for him and she was getting out of hand and embarrassing, so we stopped inviting them out with us. Her husband missed the guys and came around saying he had been cheating on her for a year and needed advice, the guys (my husband and friends) were willing to hear him out. He said the other girl was pregnant, and he was ready to leave his ********* wife. He said he told his whole family already and he needed my husbands support n friendship. I was disgusted by it, and mad because she was a friend of mine and when they are not together i have fun with her. Several months went by and he had not left her and I told him it was too uncomfortable to hang out with her knowing what I know. Long story short, he was lying about it all...he has no time for another girl my friend has him on check so bad he can't even carry enough money to cheat. Now she keeps calling me to have play dates and for Coffee and I keep making excuses. I can't tell her its too weird and at this point I really don't want to be around them....he lied about cheating to get pity and Im guessing to get a little bit of his manhood back. I just don't know what to do. We have a lot of mutual friends and we will be running into each-other a lot.