Guys, He lied to me for a year about being married with a kid why?

I met a man last year and we started dating. Had a great relationship and we seen each other often. We did however live a few hours apart but would travel to see each other. He told me he lived with his brother, and I had even chatted with his brother a few times via FaceTime. The further into our relationship when we wanted more time together like spending weekends together we decided to get a hotel together that way we’d have our privacy so we weren’t there with his brother. This worked for us. We had our alone time and everything was great. We discussed me moving closer to him. Just how much we missed each other when we weren’t together and we talked every single day. He truly was the man of my dreams. I thought. I recently went to stay with him for the weekend and we planned our whole weekend. Had a great time and upon leaving the hotel I discovered via Facebook a sellers page, once on there I noticed a lady who had a man on her profile that looked like my bf…he doesn’t have fb…I clicked on her page and it was him! Upon looking I realized they had been together for years! He was married! And recently had a baby just before we started talking, he never mentioned any of to me!! He mentioned having an older child but not this one? Why hide a child from me? Why hide a whole life? What could have been this man’s purpose with me? Do you think he had intentions on leaving his wife? Was he just having his cake and eating it to? He never lived with the brother by the way it was all a lie. A whole year a lie. Someone help me? I told the wife. She thanked me and I gave her everything I had of proof of the affair. I’m heartbroken, I cared for this man soooo much. A part of me misses him and wants him back so bad. I loved him but he lied and basically cheated on me as well even though he cheated on his wife with me. I feel cheated too. A whole year of my life was a lie. Advice please!

Guys, He lied to me for a year about being married with a kid why?
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