GODDAMMIT, this is infuriating!
Even if them meeting up would only lead to a break up, it's best to end things then and there rather than dragging it on and making both parties suffer any more than they already have!
Besides this is all contrived bullshit anyways, if they meet up and talk things up, their relationship could be fixed. Hoshino is only running away because she has bad friends that made weird faces when she showed up without make up! She didn't allow her own boyfriend to be there for her when she needed and kept running away only prolonging her own suffering, let them meet up and either fix their relationship or put an end to it!