Again? How much do I believe?

I have been married for 15 years, have 2 teenage kids, dog, house... About 4 years ago my wife got her nursing degree and began working at a hospital. She was a stay at home mom. I knew it would be a different experience for her and was excited for this new phase. Her circle of friends grew and she began to lose contact with old friends. I have always been very trusting and allowed her to move freely in this new space. All this eventually led to an affair with a co-worker of hers. I had the feeling some of her stories weren't adding up. She was bringing her phone into the bathroom, having girls night sleepovers... all the warning signs. I checked the cell phone records and called the number and sure enough. Guy. After I found out, I confronted her and she confessed. After much thought, we agreed to work it out. During the next couple months I caught her with 2nd cell phone, busted her driving to a company lunch together and was finally DONE. I used the word divorce. She told so many lies it amazed me and I don't believe she told me everything. That seemed to move the situation. She stopped the suspicious behavior, I made changes to the routine to make her happy. We seemed to have turned a corner. Over the last few months I felt something wasn't right. Then yesterday she suddenly said she was going to study for a test to stay certified. Said her friends kids were gone so she was going over there. I checked the cell records and a strange number was there just before she left. I called the number this morning and asked who it was... same guy. Of course she is saying she was studying and in those text messages she was telling him to go away. I know I don't believe her. I guess bottom line is, does it matter what she says? Should I even listen to her or just move to divorce.

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