Narcassistic husband

I have been with my husband 11 years and married for 1. When we got married the gloves really went off he went from being a lovely caring sensitive person to a cold hearted person who became so selfish and everything was all about him. We split up a couple of months ago and still wants to be friends. I had a lightbulb moment yesterday looking back at our relationship and little ways he would put me down and try to over power me how the fuck did it take 11 years and separation to see his true colours and to make it worse I still love him and trying to fight now to go back there and get sucked back in :(