I believe it was in response to this from newtoday:
Find the strength and confidence to find another man who wants you and only you.
(Frankly I find the fact that he messages others when he is with you quite disrespectful and rude, especially considering he leaves you in silence when he's with the others!)
You will be left feeling (as you already feel) that you are not enough. You are right, you will never be enough for him. He will never choose to be with only you. He told you he's Poly, believe him. But you ARE enough for YOU and you are MORE than enough for the man that deserves you.
You deserve a man who will make you a priority , not an option; a man who will be loyal and faithful and honest. You deserve someone that will see you as a blessing and not want to go silent on you.