What should I do in a situation like this (with my boyfriend)?

Okay, thing is that I’ve had a boyfriend for 7 months and we’re absolutely great together. We like sorta the same stuff, play the same games, eat the same food, and have great comunication and we confide in each other a lot. Apart from being my boyfriend, he’s my best friend and I’m his. Thing is I’m 16 and he’s 18. He graduated high school last may, and couldn’t go to study where he wanted because his parents wouldn’t help him. Apart from him, he has two older and two younger brothers living at his house. His two older brothers didn’t go to study, so he was gonna be the first one. But his parents wouldn’t help him out or give him support. My mom get’s along great with him, but told him that she doesn’t want her daughter with a guy that can’t overcome himself. So he started looking for colleges around here but couldnt find one that would give what he wanted. So a week before our 7 monthaversary (xD) he told me we probably had to break up because I was gonna go to college and he wanted what’s best for me, that being with him would only slow me down. After a LOT of crying we both finally found a college in the town next to ours, and a bus will take him to school. After that he managed to get a good job. Well, today we start talking, and he tells me that when I go to college we’re gonna break up because I’m probably going to find someone better for me there and that I’m probably gonna hook up with my ex again because he goes to the same college. I really don’t want to break up with him ever. I know it’s a little silly, but after being with him I can’t imagine life with someone else. He even told me he would love to marry me and make a happy family together, because he loves me with all his heart and I beleive him. But he said that when I’ll go to college that I’ll start getting different and meeting good guys studying to be profesionals and that all he wants is the best for me. I really don’t want to happen, I love him too much to leave him. He’s been a ray of sunshine in my life. He knows what’s wrong with me without even asking, he knows me feelings, my mind, my body… everything. I seriously don’t think I’d let another man do all the things he does to me, because I wouldn’t feel comfortable. But I really don’t know what to do, I don’t want to lose him! Can someone help?