Ok you late nighters, guys especially, give a girl some needed advice!!!?

I, according to my mate, have a huge problem. Love, thats not the problem, we both know that goes without saying. Long story. He doesnt see his children, they are grown, and live their own lives. One, he chooses not to speak with because of her choices. My children continue to be part of my life. My oldest, her 3rd year in college, my son chose to live with his father, they are close, my 19 year old daughter, is mentally handicapped. Extremely intelligent, yet, slow, shall we say. Though she is 19, she seems to just now be going thru the rebellious teen stage. The young adult, yet still afraid to grow up. Creating a hardship for my sweetie. Wants more time with me, doesnt want to have the hassles of this problem. Then, there is the other problem. We have so much fun together. Make each other laugh, cry, all the emotions, work great together, plan well together, yet, in a heartbeat i can say something, unknowingly, and make him upset to the point he wont speak to me for days. Truly, i gave my daughter some advice he didnt agree with. He got upset, i lashed out....thats probably the problem, and we didnt speak all weekend. He says this is a problem i have that is getting much worse and is going to be the end of our relationship. I tell him that, yes i lash out, but i never know when something i say is going to affect him and cause him to give me the silent treatment for days. I feel he is too harsh and expects me to never say the wrong things, and expects life to be perfect, with no problems or no stress.. Is there a way for me to get around this? God knows i would do anything for him, and am open to all answers. I dont think i am right all the time, but i dont think he is either. This is a dedicated, educated, compassionate man, but i seem to be missing the link that can make our relationship really work. Any advice is greatly appreciated. Thanks.Ok you late nighters, guys especially, give a girl some needed advice!!!?
Hate to be blunt but he needs to grow up, he fell in love with you the way you are, You are now one with him in marriage, but have your own set of values and opinions. Some of these are going to clash with his. Turning a cold shoulder when this happens is not the way to handle it. This is especially not a characteristic of a man. You are absolutely right to give his children your advice if they come to you for it. And I understand you are only trying to help and have his daughters best interest. But you also must realize no matter how old she gets that's his little girl, so it is going to hit him a little harder when she goes against his judgment. But you need to let him know that the women he fell in love with would never make a decision that involves any of your children without thinking it through first. And if he loved you enough to marry you then he should love you enough to trust that you will make the right choices and advise his daughter and other children what the pros and cons are of their decisions in life and let their father know that they are adults and he raised them to be their own person and to make the right decisions.