Great website - Chump Lady.
Read this page on finding your anger and right to feel angry:
When I read on infidelity boards, and some poor soul is reckoning with the aftermath of DDay, I see it posted time and again “Get mad!” “Find your anger!” “Where are your balls?! Don’t be a fucking doormat!” As is often the case, the chump is wallowing around, trying to make sense of bullshit, doing the humiliating dance of “pick me!” and generally just spinning their wheels miserably
Why is anger so hard for chumps? Well, first of all — you love the cheater. (Or did.) It’s scary to be angry at the people we love. Maybe they’ll leave us. Maybe they’ll let us down in other worse ways (are there other worse ways? Because people, I think you’ve arrived at worse here.) Second, to get good and righteously pissed off at injustice, you have to value yourself. You have to operate from the assumption that you deserve better than this. And that sounds so common sense, but if you’ve been mindfucked for a long time, gaslighted, made to feel only worthy as kibble production for the Great Narcissist, it may be hard to summon up the sense that hey, you MATTER. And third, anger is so hard because we get a lot of messages to not be angry. Especially women. No one will ever date you if you’re angry. Seriously, you’re unfuckable you shrieking harpy. Okay, not only is it unattractive, it’s Wrong! You should forgive and understand and choke down that shit sandwich and say thank you, this has been a learning experience. Don’t do anger, do enlightenment
www.chumplady.com/2013/01/got-anger/