It's an awkward question. If I'm in a loving relationship, then I wouldn't have a problem saying it (and therefore it wouldn't be out of obligation). And if I'm not, then obviously it's euphemistic; in which case I also wouldn't have a problem saying it. Just like I don't have a problem saying I love the beach. I think you're referring to unrequited love. When someone is infatuated with you and you aren't. Well, then I would feel obligated to have a serious conversation with that person and likely end the relationship.
Well Iv'e Got The Best Of Two Worlds.. My Right Hand Is The "Love Of My Life",.. And My Left Hand Is My "Sneaky Bit On The Side".... Sofar One Hasn't Found Out About The Other...(touch wood). Cheers Glen.