How to ask FWB's if he's seeing someone else?

Anonymous
My FWB's hasn't really been all that interested in me lately and I want to know why. I already asked him if he still wanted to do this and he said yes, but he never mentions sex anymore. So it got me to thinking that maybe he doesn't need me anymore cause he's found someone else. How would I go about asking him if he has another girl? Or hint that I think he's seeing someone else...what would be some ways to do that without actually coming out and saying it?
How to ask FWB's if he's seeing someone else?
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