Why is he now telling me about his girlfriend?

Anonymous
My coworker and I have become extremely close in the last 5 months. We talk constantly and it’s moved to talking outside of work. Conversation has been so deep and personal that I really believed we were at the beginning of a relationship. During an all day texting session recently- he acknowledged he has a girlfriend. I was devastated and forced to play it off because it’s not like he’d ever made some official attempt to “romance” me - it’s was just obvious we had a deep, close connection.
I have to believe he’s had feelings for me and this is partly why he kept this secret.
Can some guy explain to me why he would do this?
Why is he now telling me about his girlfriend?
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