<human>: I know it's considered bad mannered to even consider looking at the Facebook of a SO, but I have been worried a lot and recently checked on her FB account (we have always shared all information, she has mine and has checked before, I have never checked hers).

One thing I noticed was that a chat log to a certain person (who has confessed to her once, but claimed it was a "drunk" friend who stole his phone) was curtailed at certain points, leaving me to be suspicious.

Can you summarize the given text in a few sentences?
<bot>: Do people actually delete chat logs on facebook just-because? I had previously shown disappointment about the friend, saying she spent too long talking to him.