Why would a guy try speaking to me around others but avoid me when we’re close?

Anonymous
There’s a guy I really like We’ve only had one convo 5 months ago.

Recently on shift a male patient was being inappropriate towards me and my crush asked someone else what happened. Then when I walked past him he made eye contact and said if anything else happens let me know and asked if I was okay.

Not sure why he was so observant as he was busy with some other task in another corridor but he had his eyes on me. He also could have just asked me directly? I also realised he wouldn’t come in corridors when it was just me and him and he waited in till I had gone. Just some awkward tension?
Why would a guy try speaking to me around others but avoid me when we’re close?
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