Yes, I like that title...Very true. I can't really say her reaction to what he did was undeserved...I think the proper thing for him to have done was to take responsibility and, well, at least read it, I guess? Read it, accept her feelings, then take responsibility either by making a harem(Though considering the tags, it's not that kind of release), or apologising and telling her that it's not possible. Tossing it out like garbage without even glancing at the contents though...? I don't blame her for slapping him. I do feel a bit bad for the girl that got rejected though. Well...Her time will come, when another nice guy who would be willing to answer her feelings in the most sweet, Vanilla filled way possible. A sequel showing that would be very much welcome, by the way? Quite the ending though. Yeah...I do agree with what she said. It's tough, and it's just about impossible to not feel bad, but it's responsibility any guy with a girlfriend who has another girl interested in him has to take.
I agree with a lot expect her slapping him and him needing to read it. Simply cause if the genders were reversed noone would care and her slapping him in general is highly inappropriate. Not to mention it's common as hell for either gender to confess to another so it is also weird to place emphasis on the girls side.
Hentai related to Sex and Squabbles Are All Part of Love