Okay, so we don’t know the full story behind this breakup. All we know for certain is that the OP, who is a guy, claims that he needs to focus on personal matters. Anyone should respect that, especially a girlfriend who would supposedly do anything for her boyfriend.
Instead, this girl freaked the heck out. We understand that she’s head-over-heels in love with her (ex)boyfriend, but she really needs to put a lid on the coo-coo. Just give the guy some breathing space, let him handle his affairs, and in the meantime, focus on yourself. If it’s meant to be, he’ll come back, and you can show him how much you support him.