confusion

After 38 years of marriage I still struggle with understanding some of the behaviours. One of them is the daily contempt and disgust my DH has for me yet he still expects the perks of marriage. He cannot understand why I no longer want to spend much time with him. He goes from screaming at me to asking me to go out to dinner with him. Never any apologies or explanation for the blow ups. Just carry on as if nothing happened. Does he just forget that he treated me terribly? I cannot just swng along with him with his moods. It's crazymaking.....