help please

So I have been dating this guy for about 8 months.He has kids and all, well this one time he was in the shower and he left the found on the bed so I decided to Snoop through his phone. I ended up finding out that he had fb seareched his ex girlfriend I don't know what to do. I confronted him about it but he says that is the only way he can see his kids. Yet he sees them every other weekend I don't know what to do, I was maybe thinking he still had feelings for her but yet he says no so why is he still Facebook searching her?