You’re not the one that needs to apologize here. You made a mistake. People forget things sometimes, that’s part of life.

He’s left you from being homeless to being homeless with 0 money and no place to put your belongings.

Unfortunately you’re in a tough situation. It’s easy for me to say to break up with him and find a new partner. But you probably feel you need to rely on him and work together since youre both homeless. So I don’t know what you should do, but I do know that you deserve an apology, not him.