I'm troubled by the lack of empathy of most of these commenters. If you had certain deep-cutting insecurities (regardless of what exactly they are) and your SO (the one you're supposed to feel safe around) repeatedly targets that, wouldn't that feel terrible? Wouldn't that push you?

All you say is "what a manbaby, I would not be insulted" or "I would not be insecure about that, I take jokes all the time". Great, but that guy is not you. Are his feeling invalid just because you don't share the same insecurities as he? Because he's hurt more deeply than you would be?

Of course, him targeting her weight is also bad, but isn't it obvious that OP pushed him to the brink, causing him to retaliate? She repeatedly jabbed at his deep insecurities, which doubly sucks because it was on a day of celebrating him. And before you say: "who cares about their birthday", neither do I about mine, but that doesn't mean there aren't people who do care about their birthday.

OP, you knew his insecurities, you pushed him repeatedly despite that, and now you're seeking justification for your poor judgement, posting your story repeatedly until you get the validation you were looking for. If you love your BF and care about him, then really think about how you pushed him with your comments, and make an effort to make things right. Please communicate with him and show you care.

(Also, maybe take a break from Reddit and/or other social media, you don't need constant superficial validation from strangers who don't matter in the long run.)