If you've been thinking about it for quite some time now, maybe it is time to break up with him. It's hard to be in a long distance relationship, especially when the other person is so busy and can't make time for you. You start to feel like you're doing all the work, and you are. It's going to be hard to not be lonely after because that's normal. You could start by taking up a new hobby or spending more time with hobbies you already have. As far as being social you might end up having to step out of your comfort zone. Do you work or go to school to where you could meet new people?
It sounds to me like you are making the right choice. Breaking up with someone you love is hard but it sounds like it's harder to be in the situation you're in now.