Can I still have a romance with Fenris from Dragon Age 2?

I have had sex with Isabela and Anders. I broke up with both of the after. It came to the scene where I was suppose to get the option to ask Fenris to stay, but I didn't get. Will he not sleep with me if I have slept with someone else? Is it just because I slept with Anders? Or is it because I slept with Anders and Isabela? Please help!|||If you have been flirting with him and are above 50% friendship or rivalry you should be able to romance him too after ending it with the others. Try going back to your estate at night, see if he shows up again. If not then you must have missed your chance.