Boyfriend broke up with me unexpectedly?

I dont think that he is cheating but who knows what really happened. I think sometimes that the girl I like likes other guys but she kisses me and tells me that im the only guy she likes but she also tells me that she likes this other giu thats like 20 so it would never work out between him and her so she isnt gonna even go for him. But she still has feelings for him so I wonder who she is really wishing was kissing her when im at her house. I just dont know how she thinks and seems like most of the time she is just playing games but there are some times when i know that she likes me. and she also acts totally different when she is around her friends than when we are at her house. She almost completely ignores the fact that i exist when she is with her friends. I feel like she is embarrassed by me when she is with her friends. Sorry to ramble