What were his motives?

From afar, saw a friend walking with his girlfriend. They seem to be on a date. However, when we made eye contact, he grabbed her arm and they hurried off like he didn't want me to see them. This makes sense if we were together and he is cheating on me but we're just friends. I also find it odd that he never mentioned he was in a relationship.

After that, he got really awkward around me. It's obvious that he has to even compose himself before he comes to approach me just to talk. He seems nervous and jittery.

Help me decode this odd behavior?
What were his motives?
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