I need help with guy stuff ha ha?

ha ha well, I really like my ex,ex boyfriend and I broke up with him. I only did it because my parents hate it when I date people and it makes them upset. But everytime I see him, i get reall really bad erflies... but the problem is, he has a girlfriend and they never talk to one another. I feel like he still likes me though because in homeroom he keeps looking at me instead of talking to his girlfriend. I think he likes me still, but why doesnt he break up with his girlfriend? thankks(: