What does it mean if the guy doesn't have his Facebook profile picture with his girlfriend?

There is this guys that I've been friends with for almost a year now. We met in college and his girlfriend goes to the near-by college. We spent a lot of time together though, and he showed signs of liking me. He never really talked about her with me and made sure he avoided me on days anytime she visited. I confronted him on liking me, but he said "i love her very much". We irregularly talk and we are not longer friends on Facebook. The thing is, he's changed his profile picture away from his girlfriend to just one of him, twice. is this some kind of signal?
What does it mean if the guy doesn't have his Facebook profile picture with his girlfriend?
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