I get that there's a gap of several years from their original hs time to now and that he's been busy, but for him and FL to seemingly forget that he dated that other girl in the original timeline... Lol
Also, almost kinda makes you want to feel sorry for the girl ...almost lol since if he's completely forgotten, then you can assume that they didn't last that long to begin with. So even without the FL there, she doesn't really have a chance... though it does seem like she did something really bad to FL in the original timeline, so good for her lol