I see Dabamf"s and psu"s point, and yeah, a terse "go away" might"ve worked. But assuming his story is completely accurate, his recollection definitely didn"t seem like the short, focused "fuck off" it should"ve been. Look:
It was more of the same, she demanded another chance where I see no chance, etc etc. Then she demanded to see the new girl, but I thought nothing of that idea. A bit more back and forth and eventually I went back up and she left.
"Eventually"? A "bit more back and forth"? "etc. etc."? Come the fuck on. That entire quote sounded like placation... and being a goddamn pussy.
I"m looking at it from Jessie"s point of view. There"s this guy I really, really like who happens to have a psycho ex-girlfriend, right? Would I rather he go downstairs to calm this bitch down with whom he has had an extended, heavily emotional relationship with (assuming Jessie knows the situation), or, would I rather he stay upstairs WITH ME on OUR date where I
insistedwe go back to his place and chance this woman coming upstairs or doing some other batshit insane thing/threat? The choice is clear - the latter in a heartbeat. She comes upstairs, so the fuck what? Locks on my door, the police on speed-dial if she finds an axe or some shit. That"s what they"re there for. AND it"d only reaffirm that this woman is a lunatic, making me respect him more for having a sack in leaving the relationship and continuing to ignore her because, hey, he likes me back enough to not give in.
If it worked out in the end, more power to you. But I wouldn"t be surprised if the choices you made negatively impact any future, close relationship with Jessie. Maybe not now, or soon, but down the line. That"s the worst thing about small but important decisions like this: you never see the fallout immediately because the new chick at this point wants to be supportive and forgiving because she likes you. That"s borrowed time, friend. Use it wisely.