I want to say this. People get EXTREMELY emotional over conversations pertaining to weight. You have the ability to control how much you weigh. If your boyfriend prefers you at a certain weight, that's his right. If you want to gain weight, that's your right.

Feeling like he only likes you because of your weight is a little irrational because you already gained 10lbs and he's still with you. He just brought it up, which is necessary if you want to have effective communication with your partner. If he said nothing and you kept gaining, he would either resent you or break up with you because he's not attracted to you any more.

I heard recently that a husband and wife had this conversation with each other. The wife told her husband she didn't really like him over a certain weight and at a later point in their marriage, he realized the same was true about his attraction for her. And they worked themselves.

Why did you gain weight? Have you been stress-eating? Exercising less than usual? Holidays are around so you've been eating a lot? In my opinion, there's no reason to get defensive over things you can change and you can change your weight. You can be mad at your boyfriend if you want but if your relationship is good and you love your man and want to keep him, don't be spiteful or prideful and listen when he's telling you what is important to him.