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

I have been dating my girlfriend for about two years now, and we have sent each other sexual pictures in the past (both over 18) but it rarely happens. Therefore I was really surprised when she asked me to fix her phone (it wouldn't send/receive calls) and during the process of fixing it I found several pictures of her posing in her underwear and topless. Not sure what to think of it, when I asked her she said she was going to send them to me for Valentine's Day and "never got around to it." We have had some issues in the past with her being very flirty with guys, and I am not sure if that is happening again. What do you all think, am I over-reacting?
<bot>: Found sexual pics on my girlfriend's phone and she said they were from me (timestamp was from more than a week ago) while fixing her phone. Should I be nervous that she might be cheating?