Hubby issues

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I have been married to this man for 15 years, endured all his teasing, jokes, comments, and you name it. This puzzles me. I say I love you and Thank you on a daily basis to let him know that he is appreciated. He doesn't say it as much, only when he goes to bed and sometimes not at all. His response is usually MmmmHmmm. What does that mean? I don't understand why a guy can't respond back with I love you to. Is it cause I say it to much or what. I don't know what to do. HELP please.