<human>: Can you provide a brief rundown of the text in within 3 sentences?

Today I asked him to borrow his phone, while we three were in the car. He was driving. He took the phone out of his pocket, but didn't give it to me right away, he was trying to do something, but I insisted and he ended up giving it to me, without doing what he was trying to. When I got the phone, there was one unread message, from a man's name. I read the text and it was clearly something written by a woman.

The message said something mundane about the person just having had lunch and ended up with "kisses". This was what made me suspicious. I quickly sent the message i wanted to send and copied the number that sent that message.

My dad has been picking more fights over nothing with my mom, specially because she works all day and comes home late from work (she works in a restaurant, double shifts. I'm sure of this, as I'm the one picking her up every night).

They've been married for 20 years, but since they got a computer and facebook, my dad is constantly on Facebook.

What is your opinion about this? I'm not sure of what's happening or if I should/can do something about it. I just don't want my mom to get hurt by this, whatever it is.
<bot>: I think my dad is cheating on my mom, I found a text message on his phone by a man's name but clearly written by a woman, the message ended with "kisses". He's on facebook all the time.