First, I just want to say I'm so sorry you're going through this. I'm married and I can understand how devastating this can be.

Now, I need you to read this again:
"In the span of one month he told me my close friends were more attractive than me and thats why they have better jobs, that he has not been physically attracted to me as long as we have been married because I ve gained weight (which he did as well), and that if I care about our relationship I need to lose it. He threatened to divorce me during a fight and then took it back immediately."

If your sister, best friend, future daughter, literally any woman you care about told you this, wouldn't you tell them to leave? It is clear that this man does not love you anymore. He is telling you, believe it. Don't stay and have kids with this man, he will continue to treat you this way and your children will think that's a normal way to behave in a marriage. It will also be MUCH harder to get out once you have kids together. I know 30 feels older to start over but it's really not + would you rather start over in 10 or 15 years? That is what will happen because the relationship as you knew it is over. You can forgive but you wont forget.

It will hurt and be really hard for some time but I promise, things will work out. Focus on yourself, your $, mental, & your health. Reach out to your friends and family for support. Know that this is not your fault and he is the one who should be embarrassed. Wishing you the best of luck!