I thought he liked me, but now not sure...help!

There is a co-worker whom I have become very good friends with. We have talked every night on the phone for the last 3 month, sometimes up to 4 hours a night. Sometimes, it's about work, but it always just leads to casual conversation. We don't see each other outside of work right now, because of different circumstances. I only work part time with him, I do have another full time job. He will randomly text me and ask how my day is, or just give him a call. The last week, he has been acting a little different, saying he just want to become a hermit. He's not married, or seeing anyone. I was not looking for anything, but have winded up having feelings for him. I'm not sure what to do know. Do I just leave things the way they are, or keep pushing for this friendship to maybe end up as something more? We have so much in common and he makes me feel better about things.
I thought he liked me, but now not sure...help!
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