Guy's Behavior

He said he sees me as a sister?

Okay so this is an interesting situation. I was dating a guy who was a pretty big butthole, and I ended up falling for his younger brother. He has always been there for me and I thought we had a connection. We would always talk through social, he would play fight with me, he has called me cute. I even told him about some cute people that would stalk me on social and it almost seemed like he got jealous. We always have fun together, and we have had some eye contact moments too. Once I gave him a piggy back ride and he slapped my butt. He is way bigger than me so I don't know how I managed that lol. Also, I even heard their mother telling the older brother I was with at the time that his younger brother was going to end up stealing me away. If I was over he would always make it a point to have his shirt off it seemed like, and would always try to prove that he was better than his brother. We had been talking a lot here recently so I decided to confess and let him know I had feelings for him. He acted like he didn’t believe me and I was just kidding... then he went on to say I had always been like a sister to him. He is across country right now so I didn’t know if that had anything to do with it. We haven’t spoke in a couple days but he is still keeping up with me on social media, viewing all of my stories, and even liking some of the same post that I like. I seriously got that vibes that something was there but nis I’m just confused. Does anyone have any insight on what could be going? I’ve loved him and cared for him for years, and I’m worried I may have lost one of my favorite people. What do you all think is going on and what should I do?
He said he sees me as a sister?
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