está fastidiando
Present progressiveél/ella/ustedconjugation offastidiar.

fastidiar

Si eran de la otra parte, es un poco más complicado, puesto que no se quiere que parezca como que se está fastidiando, o que no se confía en que ellos harán lo que acordaron.
If they were the other party's, it's a bit more difficult, since you don't want to sound like you're nagging or don't trust them to do what they've agreed to.
Vicky se está fastidiando de que Diego no deja de invitarla a salir cada vez que la ve.
Vicky is getting annoyed that Diego keeps on asking her out every time he sees her.
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