Girl was looking down and smiling while walking next to a guy who was staring at me with WIDELY OPENED EYES (he did not stop staring one bit) why was?

I was walking in a Walmart and this chick and dude walking with each other were talking. Then when they saw me the dude was staring at me (didn’t blink once, didn’t take his eyes off me either). I kept looking at the dude then the girl (multiple times) every time I looked at the girl she looked down and smiled. So my question is What is the dudes deal? Did he punk me because I kept looking away? Was the chick mocking me or blushing with her actions? Also also when I left the store there was this smaller dude walking on my heels, when I looked back over my shoulder he darted off Can someone explain this whole scenario to me please if possible, thank you

Girl was looking down and smiling while walking next to a guy who was staring at me with WIDELY OPENED EYES (he did not stop staring one bit) why was?
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