I caught my Girlfriend doing something really weird...?

So one day i came home from work and went upstairs to my bedroom to find my girlfriend getting it on with a crucifix while yelling out about some guy name heyzus. I was so shocked i left and stayed the night at a motel down the street. I haven't talked to her since because I don't know what to do. What should I do and should i be worried about her cheating on me with this heyzus guy?