<human>: My bf and I have a great relationship for the past year and a half. I haven't been noticing any strange behavior from him but the other day I checked his phone out of curiosity (and I know I shouldn't have) I noticed that he had been talking to this girl for about 25 min and multiple times during that day and before. 

The other conversations were short but he's told me before that he doesn't talk to girls besides me. He has a blocker app on his phone because we've had issues with exes contacting him. And in it I saw that he had a message from the same girl. She was just asking him if he had fallen asleep. 

Don't know what to do. He doesn't know that I was looking through his phone since he had left it in the bedroom. But he did notice that I was a bit off. We just talked during the night and he mentioned that some girl has been hitting him up and it was the same girl I saw in his call history. He says he hasn't been talking to her but he obviously has. Should I confront him about it or just forget about it? I need your advice guys.

Could you distill the essence of the text into 1-3 sentences?
<bot>: bf has been talking to a girl a lot over the phone lately. Don't know if I should ask him bc I was snooping on his phone. Need advice on how to handle the situation.