How do I break up with my boyfriend? Please help me!?

[jamie]

I am 18 and my boyfriend is 22. I've been with my current boyfriend for a little over a year now. At first I was head over heels and I wanted to be with him forever. However about two months ago it really started to wear off and now I find myself not attracted to him at all. I dont get excited to see him or touch him and I find myself getting annoyed. My dad is very sick and dying and my boyfriend is such a big help with my family. He does everything and so I feel guilty that he's done so much.I am leaving for college in September but he wants to stay together and get married and be together forever. He always talks about it and says he loves me so much. How do I tell him and when and what do I say. Please help me I've never had to be in this position before. Thank you