Cheating Husband

I just found out that my husband is on tinder. A friend of mine sent me an image of the same. I had seen the app on his phone a few months back. We have just recently been married. About 8 months to our marriage. I asked him why this app was there on his phone, he said he had forgotten to delete it. After my friend sent me the image of him still being there on tinder, i too downloaded the app to find out the truth. Just after a few swipes his profile appeared and clicked yes on it. And to my horror, we both matched, after he clicking yes on my profile too. I created an fake account, using a fake name and a animie image. To add to the horror, he is still chatting with chatting me in glory. Long story short, i have decided to quit this marriage. Can anyone kindly help me how should go about it. I could use this as evidence. There are other issues that are there with our relationship where i have given soo much to him but he has been distant. I dont wish to sound like a saint but i am only looking for some advice. i am completely lost of words and direction at the moment. Thanks