Does he feel the need to protect me?

Whenever I’m about to walk into a room, and the guy I like he knows that there’s another guy in there and he immediately follows me into that room. I stepped into the room, see another guy in there and I look back and there’s the guy I like standing behind me, staring at the guy then at me. He doesn’t say anything just watching. I don’t understand why he does that? what does that mean?

Does he feel the need to protect me?
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