Should we just break up?

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I've been with this guy since my freshman year in high school, and we've been through everything together.I lost my [v] to him and I've cried to him, and told him I wanted to be with him forever.Complete vulnerability. He is on the football team and received a football scholarship to UCLA. No matter what he says or assures me, I have this deep feeling that he's going to cheat on me, or that long-distance won't work. I don't want to have any false hope but he keeps telling me that he wouldn't, but I know that sometimes people lie. Should we just break up?