I'm so tired of rumors being spread

When I was married I gave my heart to him. I knew what it felt like to be cheated on and I promised I would never ever cheat.... and I didn't! Thought out my 4.5 years of marriage not once did I even think about doing that and I was happy I married the man of my dreams . Things kinda got odd the past few months and I kept asking him what's wrong and he'd never tell me. Turns out he fell out of love with me and started talking to this girl and developed feelings for her. I was hurt and devastated that the man I thought would never cheat did.... and so we've been broken up about 2 months and the divorce is thankfully almost over ..... he ended making that girl his gf shortly after he left and I'd say a month and a half I started talking to my guy friend I've known for 6 years we exchanged some pics but then just talked like friends.... so somehow my ex sister law got a hold of them and told me I was a slut and that I cheated on him ... how is it cheating if WE ARE NOT TOGETHER AND HE HAS A GF.... so she's going around telling people I cheated on him and then ran to him saying I was cheating my entire marriage .... he was my best friend , my soul mate ... don't you dare freaking tell me I never loved him because I did.... and parts of me still do but as a friend. I'm just trying to move on like he did and all of a sudden it's my fault that he left :( I wish the drama would stop