What should I do

A guy I’m talking to sneakily had a 3 hour conversation with his Ex-girlfriend whilst I was busy on Monday. He says she called him out of nowhere and he picked up. But I know for a fact he’s been dialing her number the past week as she’s been doing the same. And to make matters worst he wouldn’t tell me what they discussed for 3-4 hours. Should I bin him or talk to him about it?

He’s not picking up my calls, I suspect he’s at basketball and she’s also at basketball...