i've never been divorced, but my parents got a divorce when i was really young and i never stopped hearing about it from either side.
both of my parents have different stories as to why it happened, my mom's story was that my dad was unfaithful...and she told me that if i was ever in a relationship where i suspected infidelity to cut it off as soon as possible, because not knowing is just as bad. my dad's second wife was unfaithful, and he gave me the advice that people who practice infidelity will never change, so he too suggested that if i was ever suspicious, to just leave the situation.
i think shimmer gave some pretty good advice, about documenting everything and opening new accounts. and definately, be prepared for him to do the worst, most devilish things to you. he may not...but it's better to be safe than sorry.
*hugs*