My husband had an affair, started say month of Aug.i did not find out until almost a year later,actually the?

following say july, i started checking the cell phone bills,never before i had no reason to no signs he was cheating he traveled on his job so there was no reason to question his whereabouts.i find out thru investigating, not from him admitting to it, or being honest about.he says the last time he seen her was like March.But the calls were still going on all the way thru June. I mean 76 calls between both of them i 1 mth, first thing in a.m. up until wee hours of the morning.For an hour sometimes.would you not say he was still seeing her, what would he be getting out of just phone calls. i believe in my heart he was still seeing and sleeping with her up until i caught him. i just want your opinion.he says it was just excitement.well then why would you start another relationship one on one with the same person, i feel like he was falling for her.he might as well have played the field if that was his reason.he seems like he was only committed to her,what do you think