Would it be very dude of me to marry a couple that I don not believe to be in love. My insides say "absolutly not, mann". However, my inner dude says " Fuck it, The bars over here". Please help guide me through this journey. Should this dude abide?
IMHO; marry them, the love is their concern, their business.
That will be their problem, not yours, just as your rug is your problem.
I can't solve your problems, sir, only you can.