Uncontrolled blushing and flirting—

Okay, so the other day I was working and there was this guy who walked in and wanted to returned some christmas lights. First thing I noticed about him was his looks. He was pretty tall compared to my height (me=5'4) He was about 5'8..5'9 ranging. He was hispanic, light skinned, clean cut, and Dropped dead gorgeous. Anyway, I exchanged the lights and rang him up for some other christmas lights he bought. The computer prompted me to check ID. So instead of looking at his name, I looked at his birthday. =) hahaha.. Fortunately, he was a beautiful Sag. His DOB 11/30. So I gave him his change and told him to have a nice day. While he was about to leave, the sensors at the door came on so he came back to ask me if it was okay that he left because he doesn't want security to tackle him. So yea,I couldn't help it but say.."I won't let security tackle you..if it beeps again it's me tackling you." and he smile and said.."is that so?" and grinned..
*sigh* Oh mmmyy I could of sworn I blushed soooo hard.
I have a boyfriend..But sometimes I find myself having these uncontrollable blushing, and I'd say stupid things to other VERY EXTREMELY ATTRACTIVE men. Why so?? I feel really bad that I do. Yet, I feel good when I say it. Why? Am I making any sense?