So if this is the case, it might be worth exploring why. Hey man, I heard you had a one-night stand with that bitch Tracy. When two males acknowledge having been intimate with the same female and remain on good terms , the men are now bonded by having shared the same igloo at one time or another. Build a proper relationship first rather than rushing into sex. And if he complies, you can have a man-date or several and gain a bunch of insights about him.
She really shouldn't need another guy in her life filling the role. Nor should you stop trusting her.