Do I stay or do I go?

[anyhope]

Yes that's right, but should I be suggesting these things to him or should he be the one coming up with them?
Or should I just say I'd consider and listen to how he thinks it would go?
I wouldn't be able to check his phone records however because his plan is unlimited so he doesn't get a detailed statement like most people do. I already checked when it all started and he was saying at one point that he wasn't talking to her, I even called the phone company because at that time both lines were under my name so I asked where the list of numbers were for his phone and they said that's not available for his line.
Another issue I have is not now.. Let's say somehow we do make it work, but if a person would do this now how do I know that another 10 years from now when things get boring again he won't go and do the same.. I mean I now know that he's capable.