Lost my confidence in telling him I like him...?

There is always a lot of questioning in a guy s head when he s thinking about starting something with a co-worker. It can cause a lot of problem and many men would hesitate a lot. Not a good sign if he avoids you on FB. On the other hand, it s positive if he initiates physical contacts like hugs. There is a kind of contradiction there as if he felt bolder when in a semi-public setting than in more private circumstances. I think you should wait until he stops running from you precisely when he has a chance to talk to you in private.