<human>: Can you provide a brief rundown of the text in within 3 sentences?

This past August my mother passed away from her stage IV colon cancer. My bf has been with me through all of it and has always been the most wonderful loving person during the good times and bad. We started dating when he was just 18, fresh out of high school and now he is about to graduate college. We have been long distance for most of our relationship, seeing each other every 2-3 weeks. He recently told me he isn't comfortable with the possibility of ending up with someone he met right out of high school.

I don't understand this line of thinking. I've asked him repeatedly if there was something I did, something wrong with the relationship, not in love any more.. I've asked all the questions one could think of and he denies any other problem other than he wants time to himself to experience the single life and meet new people. 

He'll be home in 5 weeks for good and said that he is willing to give us an honest chance because I got mad and told him that this upcoming year will be the first time we'll be within 20 minutes of each other with no school or illness to get in our way. 

One other important detail: About 2 years ago we broke up for a few months because once before he felt he needed to be single for awhile to figure things out. He tried dating one girl while we were separated and just could not do it because he thought about me. Once he was home for the summer he immediately asked for me back and I waited a few months of dating, talking, working things out before finally saying yes and taking him back.

My gut feeling tells me I am going to end up with this guy. I also know he is completely stressed out from all the deadlines he has to reach before graduation. His dream was always to be a doctor but now he isn't sure if that's what he wants to do. Deep down I feel he's just lost and taking it out on our relationship.
<bot>: SO says he isn't sure he wants to end up with the girl he dated right out of high school. Is this a real problem that others have gone through? Is there any way to salvage us?