My husband said with a straight face, is there a psychological problem?

Maybe it's not a psychological problem. If your husband is the same as before he got married, it means that he is a person who is not good at expressing his inner feelings in words and prefers quietness, which is what others call honesty. What's more, he is very cheerful and humorous before marriage, which is what you said after marriage. This may be because of too much pressure and accumulation in psychology, which makes him feel very dull. The third situation is that your relationship has lost its shelf life, which means that he feels nothing new, and every day is like this! Never changed, without the first love, life tends to be calm.