That stalker fan shyt is scary af there are the delusional ones who believe they're in love with their object of affection and can't understand why they're being repeatedly rejected and turn vengeful, there are the ones who know they're creeping their target out and seemingly get off to it and then there are the spurned fans who buy all the merch and obsess about an idolized version of them but won't attempt to communicate or make contact until they decide they've been betrayed somehow and need to hurt them.
Alexa probably should've never acknowledged him but at the same time who knows how many times she silently blocked his accounts before publicly asking him to stop. He is of the delusional variety and thought he could weigh her down, then he started to blame her significant other for being in the way and now with his preemptive apology for what he's going to do, he is blaming her.