We've been friends for two years and he never mentioned he had a girlfriend. Should I still be friends with him?

I met this guy through a mutual friend in our industry roughly two years ago. Our friendship grew and he turned into one of my best friends. I just recently found out he has a long-term girlfriend (5+ years) through a random conversation with that same mutual friend who didn't know that I didn't know about her.

I'm confused, but mostly hurt by this for being put into a situation I would have liked to have had a say in. I've opened up about my life to him, including my love life, and he never once mentioned he was in a serious relationship. He always answered questions about his weekend plans or other things with "me" or "I" or "my house", etc in a way that suggested he was single and wasn't seeing anyone.

We've talked almost every single day since we met and I wish I had known he had a partner so I wouldn't have opened up so much to someone else's boyfriend. I would never do that to another woman.

WHY would he hide the fact that he's been in a relationship? AND Should I still be friends with him after this? I'm torn, especially since we have a bunch of mutual friends.

It's only been a few days at this point, but he's been liking all of my stuff on social media and poking at me to try to get my attention since we haven't had a conversation since I found out. I haven't told him that's the reason I've stopped responding to him and I don't know what to do.

We've been friends for two years and he never mentioned he had a girlfriend. Should I still be friends with him?
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