Confused about the boyfriend.?

I dont understand. I really do feel as if Ive moved on and my feelings changed but Im not letting go for the sake of comfort abd being used to him. Today, when I walked over to him, I felt like kissing him. Then I was leaning against him as I worked on homework and then he put his head close to my neck and I looked down and started to rub his knee. And the feeling was soo emotionally intimate. Then later on, when my father picked me up from school, I saw him walking home and it hurt bad to see him walking with an old friend of mine [girl]. Then I grew very angry and still am at the moment. Sometimes I dont understand these feelings. When we are together, I hate it. But when we are friends I like it, but I still get jealous, we tend to hang out more. Its like I change but I still get jealous and these feelings. Sometimes I wonder if they are just the moment, but I also get these bad feelings in my stomach about commitment. I dont understand whats wrong. :/