Having a rough morning mentally. Got into an explosive fight

Having a rough morning mentally. Got into an explosive fight with this toxic guy I’ve been talking to. I tried to apologize and he proceeded to give me every reason why I’m “so screwed up,” and then ended our relationship over text. He then went out with another girl and posted pictures of them, even one of them kissing. I’m feeling crushed right now. Completely defeated, disposable, worthless. Too crazy or flawed to be loved by someone. I’m so anxious and upset I’m physically ill. Not sure how to make it through the day without relapsing.