You’re not necessarily being paranoid. Long distance relationships are a lot more difficult than in town relationships, and you’ve gone from an in town relationship to one that’s long distance. In addition, colleges allow you to be with more single, available people in one place at one time — than any other time in your life, so there is opportunity for both of you to date others if you wanted to. And lastly, living at college can be a lot of work beyond the academic rigor. Living with roommates, living off campus, having to take care of laundry, bills and shopping for the first time ever, can be a burden for some students, for the first times in their lives.
Since he’s asking for the break, and you’re not happy with the communication between the two of you, it sounds like this is inevitable. My advice is to stay upbeat when talking to him (any complaining is going to make him associate negativity with you and his relationship with you), and stalk him or try to find out what he’s doing. Instead, take the break with the best intentions to focus on school work, your own life at your commuter school, and see where things go. Spring break is coming up in a month or so, and you’ll have an opportunity to see him then. 😉