I've had a few guys glance at me and then look back real quick, like a double take but they just keep doing walking or doing what they're doing. They never look back. Is that a taletell sign I'm not attractive?
They're checking you outtt girl and they glance again because they want you to check them out too. OR they notice you staring at them, so to not make it so obvious theyre checking you out, they look away and then look right back at you..