I think my ex has friendzoned me

Me (22M) and my ex (21F) had dated for 4.5 years and she is the love of my life. The last two years we were dating she cucked me and fucked four other men 2 long term. She decided she wanted to end the relationship but still says she wants to be "best friends" I still take her to dinner I still pay for meals and clothes and she still lives with me but I sleep on the couch and I know she invites other guys when I am at work to fuck her on our old bed. I have pics of the old cucking that happened.