<human>: Can you provide a brief overview of the text?

So my friend [26F] started dating this guy [30M] 2-3 weeks ago. Not sure if my age matters [25F].

Last weekend, she gets out of her apartment to find that her door has been spray painted with the word "WHORE" on it. Also, at the same time, her bf's car has been keyed with the word "CHEATER" on it.

It seems like something a "crazy ex" might do (or a "current" gf???), but the guy claims he doesn't know what it's about, and that it must be a case of mistaken identity, because he doesn't know anyone who would do that to him.

He seems nice enough, and I wouldn't have questioned it until now, but am I wrong to be suspicious of this guy? What would you think in this situation?
<bot>: Friend and her bf get vandalized by a "crazy ex" who implies the bf is cheating, but he denies that it has anything to do with him. Should she actually believe him?*