He loves her but likes me. Now what?

My guy friend is extremely devoted to his girlfriend. He loves her. He'd do anything for her but personally I think she treats him like sh*t.

He talks to me every single day and texts me all the time. He recently told me that he thinks I'm cute (emphasizing the fact that he wasn't flirting).

I'm pretty sure that he loves her but secretly likes me. He probably feels emotionally deprived because his girlfriend is treating him so badly.

What should I do?
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I mean that I'm positive that he loves her but also likes me too.
He loves her but likes me. Now what?
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