Maybe you're not saying I love you enough. Some people need to hear it daily. I am not one of these people. But, sometimes in marriage, it is not only what is done but what is said. I recommend reading the 5 Love Languages. It might help you discover yours and his and that might strengthen this part of the relationship.
It could also be that he is just craving that intimacy with you right now, that reassurance that your love cannot be taken from him. Sometimes, in some seasons, people just feel insecure and need to know that they are truly loved as they are, accepted and valued despite their faults and flaws. This might be a season when encouragement is needed.
The 5 Love Languages: The Secret to Love That Lasts: Gary D Chapman: 9780802473158: Amazon.com: Books
Counseling is always an option, too, but only if you feel that it is needful. Sometimes just having that safe time to talk openly is good. If you can do that without someone else there to mediate and guide the conversation, do it. If not, seek out godly counsel from your pastor or a married couple in your church.