Do guys do this when they are scared to approach you?

Hi guys,

I sometimes get the impression guys are afraid to approach me. Is it true or is there a other reason for this behavior:
Example:
- I was at a party with a friend, catching a guy starting at me all night. We decided to go to the bathroom. When I came out this guy was now standing next to my friend giving her his number, while looking at me with big eyes! ;
-I'm catching a guy staring at me. He approaches our table asking if we are single and looking me straight in the eye. My friend starts talking to the guy and he turns to her, while in the midst of their conversation staring at me. I felt like I was the one he wanted to talk to;
- just random staring and doing nothing;
- approaching and suddenly make a turn to my friend.

Note : while going out there is always a guy showing interest, so it's not like this happens all the time.
Do guys do this when they are scared to approach you?
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