finman

The opposite of a wingman. A finman is someone who gets rid of unwanted suitors for a friend, helps their friend focus on getting one person and weeding out the creeps.
(Name finman because that's the name of the first guy my friend and I chose to apply this to.)

"I want to get back with him but all these guys keep talking to me and getting in my way."
"Don't worry dude, I got your back, I'll finman you."