Is it romantic or just friends?

Guy friend/acquaintance said "I really like you" then went on and on about what a great person I am and about how much fun he has with me. Then said he just wanted to tell me that and he left. He is married so I do not know what it means. I like him but said nothing since he is married. He was totally sincere.
Background is that within the first few times of meeting me he said I was beautiful and I made him happy--like he had a crush on me. He is not a flirt or player type, one of my female friends verified this.
Is it romantic or just friends?
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