Some people, especially men, don't easily say "I love you" ; and very many people who do very easily say "I love you" don't actually feel love or act lovingly. And as you confirm, he DOES show his love for you, and that is far, far, more important. Maybe some sessions with a marriage counsellor could help, perhaps help you to clarify what more "serious" you are looking for in the relationship, and how to get there from here.
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