Hi brokendreams, I'm so sorry you are here.
I won't give you any specific advice on what to do, but I'll talk a little about my history first -- hopefully this will help more with how to wrap your head around what you've discovered, and your thinking moving forward.
When I discovered my XWH was cheating on me I thought my life had ended. I was TERRIFIED about what it meant for me. I worked for my WH, we owned a business together. Our identities were linked within our social circles, and the community around out business. If I lost him, I would lose everything and I was so panicked that I turned myself inside out to try to please him, to try to fix the problem.
It turned out that my worst fears came true. I did in fact, lose everything. It was incredibly painful. I tried so hard and yet I could not change who he was. He was a liar, and a cheater, and he didn't want me any more. It was like everything I knew about him was suddenly a lie. I couldn't make sense of it. I thought I knew WHO he was, and yet, I didn't.
He would stay out and screw his mistress(es). He lied in counselling. He changed things in his phone and email to trick me. He set up fake email accounts. He lied to everyone, me, his fuckbudies, our customers, our friends. He accused me of cheating, of lying, of stealing from our business. I was suicidal and profoundly depressed.
It was awful. My doctor was so worried about me that he ordered me to leave, to pack up and get out. He said if I didn't I'd either end up in jail for murder, in the morgue from suicide, or in the hospital from a failed suicide attempt.
I left our house. To retaliate, he fired me, so I lost my job. My situation got worse as I ran out of benefits, couldn't work due to the depression, found and lost part time work, got kicked out of some "free" housing, and ended up homeless, living in an RV, borrowing money to eat. At one point I had $12.57 in my purse and that was it.
But, I recovered. It took a lot of therapy and a really long time. I'm now gainfully employed, living in a place I love, single, and happy.
It would have been so much better if I'd just left from the beginning. I would have been mentally much healthier rather than struggling to cling to a fake life, trying to breathe life into the corpse of our marriage.
But I was afraid. My self esteem was shattered. I was worried I'd lose all my friends, my job, my home, everything, including my husband. I wanted to keep it all together. But I couldn't do it alone and it turned out he was determined to lie and twist things around so it was my fault (it wasn't of course).
I wanted to save the life I had. I was terrified of losing it. It turns out I couldn't save it and trying to only made everything so much worse. If I'd just accepted the new reality I was facing instead of trying to convince myself that I could fix it and make it "like it used to be" - I would have been able to rebuild my life so much faster.
So, back to you. Your wife is a liar and a cheater and she wants the comfort and convenience of having you support her.
But the best thing you can do is face your new reality and try not to convince yourself that what you THOUGHT about your life was in fact the reality of your life. You were tricked. Your wife has defrauded you. Accept the truth of what you have found. It's real. Those photos on her phone are REALLY who she is. Who you thought she is, is NOT REALITY. Adjust your thinking to what is REAL.
Your self confidence is going to take a huge hit, no matter what. First, you've been lied to in some huge and profound ways. Second, the life you thought you had, is GONE. It's like there was a flood and everything got washed away. You can't fix it. It's destroyed. It's a mess. And your wife did this. It's her fault. Don't think you can forgive her, it's not really forgivable.
You can only recover yourself. You can only save yourself. Your wife won't be able to help you. And you can't fix her.
Do not be afraid about what will happen next. See a lawyer, see a therapist, read here in the healing library and post here frequently. Keep writing your story. You can use the forum here as a journal, get your thoughts out, share what happens, and get some feedback. There's a LOT of wisdom here to help you.
Don't grovel. Don't ask her to stay with you. Focus on getting out of infidelity, so you don't end up being a cuckold.
You have a good job and a new life ahead of you. You can do this. It's going to be ugly for a while but you will get through it.