Boyfriend breakup

So I broke up with my boyfriend last night for a really stupid reason but on top of that stupid reason there were many more: he was planning to breakup with me in June anyway because he's moving to a 4-year, and second my sister and her boyfriend would always argue with him and he'd end up with the reply, "well I won't be knowing you in a few years anyway" so he obviously didn't see me in his future and we've spoken about this before. Although he was planning to end this in June and I ended it last night why do I feel so faulted for? I didn't realize that I'd end up liking him so much (pointer: we've been bf/gf for 3 months now) and last night I could've go to sleep just crying over it. I'm so sad.