Should you be heartbroken if your best friend forced your other friend to say he was in love with you when he didn't mean it?

Your friend shouldn't have done that, but I'm sure they meant it in a kind way. Don't be so sure this guy doesn't love you. He could have been too shy and most guys shy away from the word "love" until they get to know the girl better. I wouldn't get heartbroken too soon. See where it leads from here. Talk to him and apologize for your friend and tell him she meant well. He may ask you how you really do feel and all you have to say is you find him attractive and wouldn't mind dating, but leave the word "love" out of it for now. He also could just accept the apology and move on. If it were me, I take the previous action I mentioned and see where it leads. Good luck!