Marital issues HELP!

Yolanda
My husband is in the military currently stationed in Washington and I live in California. We hardly see each other in so sick of seeing him a few times a year that's not what marriage is about. I recently touched the subject that I'm ready to move to WA and start our lives as a married couple.. I was not ready for the outcome he became extremely aggressive and made it clear that he did not want me to move out there.. Made me question why he was so against me moving to WA. Turns out he is having an affair with his best friends sister /: 
Not only has he been sleeping with her but he moved in with her 2 months ago.
Any advise on what my next move should be?..