How do you tell when a guy has stopped loving you?

sometimes people will say, I don't love you. And you won't listen. Other times they act like they don't love you and you don't pay attention. If you ask this question there must be a a"reason" and that reason is why you are questioning his love. Ask yourself, what is he doing to make me feel thisway? Love is an action meaning he acts like he loves you when he isn't thinking of himself and hes doing nice things for you with you, right? If he is acting selfish, standoffish, uninterested than you should let him know how you feel and get things on the table. You might be wrong and ony he can clarify.