My bf and I broke up! :(

I am sad. This girl who works on the platform of the train (Cedar Point & Lake Erie Railroad) messaged me on FB to ask if I knew whether Nate was single because she thought he was cute and wanted to pursue him. I didn't answer right away because I wasn't sure if this girl knew his family or not and was fishing for information. At the time, I didn't know she worked on the train. My ex BF works as an engineer on the steam engine. So, I screenshot the messages and sent the screenshot to him. He asked me what I responded, and I told him, nothing because I wasn't sure if she knew his family or not. Anyways, we were long distance and coming up on a year of seeing each other in person. I was supposed to move up north to work at Cedar Point in April but due to my hubby getting a promotion with his job and we have puppies, his promotion would require him being away for a week at a time and someone needed to be home to take care of the pups. So I stayed home in TN instead of moving up north. I moved up north for 6 months, and down south for 6 months. It was a perfect setup. So he expressed that the long distance was making it hard on the relationship and we mutually decided to break up and I answered the girl with "he is single." 

Now, I kept dreaming of our breakup all night last night. In the dream, it was a setup. They had been hanging out a lot and they wanted to date each other, but I was in the way. So they came up with her messaging me to play like she was interested in him and he knew I would go to him about it, which I did. He didn't want to be the one to initiate the conversation. This was the dream!

So of course, I messaged him today telling him about my dreams, and all he said was "lol okay" and that seemed fishy to me. He has never answered me like that, even when we were friends. It was cold and felt different. Kinda rude. It hurt. He didn't confirm or deny it at all. 

So, it just seems like he is acting like an asshole now.

Edited to add: He is still keeping our streaks alive for now, and including me in his daily work journey, so that makes me happy. I want to be friends with him still. He is a great guy. And I understand he has needs and I do not want to keep him from those! And the girl that is interested in him is super cute!