I am 23 (almost 24). My boyfriend and I have been dating for about a year, and he has bad manners. He chews with his mouth open/talks with his mouth full, and has been doing this almost the entire time we've been dating.
I have been patiently putting up with it. I talk to him about it over, and over. Each time we go out to eat, he does it again, and each time I talk to him he gives the same old excuse "That's why I push the food to the side of my mouth, so I can still talk." I have told him over, and over that I hate that behavior, and it drives me nuts but he still does it.
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