Well, I don't even actually disapprove of self-insert fiction per se (even if it's a common feature of a lot of really bad writing), but this doesn't seem like that at all—I mean, we'll see, but I was kind of expecting the current girl to stick around and remain the love interest. (Just, having her move in next door seems an odd choice otherwise, plot-trajectory-wise.)
And I have no real desire to be in her shoes, and it doesn't feel like I'm supposed to want to either.