My crush blocked me on Facebook for no reason?

Anonymous
ok i have been crushing on this guy for months. he and i work together and get along pretty well. he and i became friends but since were both really busy we couldn't talk very much at work so we added each other on Facebook.
we talked every nigh after work for 1 to 2 hours and at work we kept it professional. when i would be by myself at work he would come around. sneak up on me or just come and have a quick exchange of words.
now when we started talking he was single but while he was talking to me he was talking to someone else as well.
when he became in a relationship with this lady i backed off of him i didn't message him or really come on to him out of respect to her.
he did the same thing after a month or so he snuck up on me and started being friendly again so we started talking again. then he pulled away after he caught himself flirting.
so we kept space then started talking again. he never told me i was bothering him and when i asked he always said no. so one day we were talking as normal and next thing i know im blocked out of nowhere and he gives me the cold shoulder.

my guy friends that I've talked to said im his Plan B. his rebound chick, his back up.
do guys have these? i would figure him being older he wouldn't be into the confusing head games

i really dont get it he acted like he was interested and then he didnt' then he did again then he pulled away then came back then blocked me. so i dont understand
My crush blocked me on Facebook for no reason?
3 Opinion