The context of the following conversation is Kendall didn't have a phone number to give to the cute guy. Kendall used Alex's number instead.:
Kendall says I hope Alex doesn't get mad at me but I gave her number to someone, for myself..
The friend responds She probably won't mind. You'd do it for her..
Kendall responds I met this really cute guy and I don't have a phone right now so I used hers..
The friend responds Just let her know and she'll help out..