Never met him in person but I still find myself drawn to him?

I met a guy online a while back and we live in the same state but have never met in person. We both have significant others and he plans to propose to his girlfriend soon and I’m truly happy for him.

I never message him first, but he messages me throughout the day nearly everyday when we are both at work. We never talk about things that are inappropriate and I love my boyfriend. I just truly enjoy speaking with my friend and I think the feeling is mutual otherwise he wouldn’t message me everyday and try to keep the conversation going, or even tell me goodnight every night.

My boyfriend trusts me and I’ve offered to show him the messages but he says he doesn’t need to see them. My friend says his girlfriend says the same thing. Should I feel bad? Am I doing something wrong?
Never met him in person but I still find myself drawn to him?
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