I know what you are going through hurts to the very fiber of your being.
1. Do not try to figure her out. I know you think you love her, but she has made it abundantly clear she has NO respect for you. She can't because she has no respect for herself.
2. Do NOT expect any help or alliance with the in-laws. Your MIL response is typical. Sadly, blood is thicker than water. Stop talking to those people -- they will work to sink you.
3. The OM is a POS. Once you figure that out, you slowly figure out your wife is a POS. Until OM is out of the picture, you are spinning your wheels.
4. The video and audio taping is NOT worth the effort you are putting into it. Change the locks on your doors. If the law comes to your place because she called them, you will get a ride to the crow-bar hotel. Unfortunately, she'll dream up some story and it will sell lock-stock-and-barrel.
5. The GAL part is for you. As hard as it is, start doing something (anything) you like to do. The first couple times it may be hard. Concentration seems to be one of the first things we lose.
6. Detach -- getting into pissing contests with her only makes you feel worse in the long run. If you are not sucked into her nonsense, you will be able to make rational decisions. The ones you are about to make will be there for a lifetime.
7. Be careful with your current actions as some people may try to paint you as vendictive -- I know that's not the case, just laying out what may be presented to the judge. Best interests of the child(ren), don't always follow common-sense guidelines.
BS (me) 57 WW (her) 51 M - 27+ years Sons - 34/21 daugh - 32/26 D-day - (A#1 Apr 98) (A#2 Oct 08) Status - minimal contact (me) living with OM (her) Divorce - Scheduled for Apr 09