Relationship...talk...?help please?

My boyfriend and i have been through tough stages in our relationship, just recently i felt like we were taking off (becoming better) and flying high, but he has been acting different and i feel it. He hasn't been wanting to do things with me as much. He says he just wants new things to do, but his attitude has changed as if he doesnt want to do anything with me and like he feels our relationship is an "oh, well..whatever happens, happens.". His dedicated pion is not the same as it was before, this saddens me because i didn't want him to change. I dont feel good enough for him, as i don't with my mother or anyone else in my family. I really love him, but why is he acting this way? He broke up with me last year and we got back together this year and he told me he wouldnt change. I feel so sad and i have been crying. I put my all into us, every single day. What should i do to sort my feelings out? Why do i feel this way? Why does he feel this way?