Girlfriend obsessed with my body?

I’m 24 M and I have a toned muscular body. My girlfriend (23) seems to be obsessed about it. We don’t live together at the moment.

But when we are at my place or her place she wants me to stay most of the time wearing only boxers or a thong. She also likes “showing” me to her roommate like that. Is it normal?
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Update. The roommate made a move on me today. I was walking around the apartment while my girlfriend was in her room. I asked her to stop, so she cried that I was hitting on her. She also scratched me on my back. My girlfriend is mad at me...
Girlfriend obsessed with my body?
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