Most Helpful Guy
You're depressed because your problem wasn't that you were in a toxic relationship, even though that was a problem. You're depressed because you derive your own happiness from being in a relationship / having someone around. You're not happy. You weren't happy when you were with your ex-boyfriend, he provided you with the excuse to pretend that you were happy.
The clue to your whole question is that you "feel so hopeless and useless like no one will ever love you". You need to love yourself. It sounds stupid and cliche and impossible but true happiness is something that you find yourself and share with your friends, family and partner. You don't get your happiness from them.
I don't know what happened in your life or why you're so down on yourself but there's nothing that a stranger online can tell you to fix that. I just hope that you realise your worth someday. Good luck.
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Most Helpful Girl
It takes a while to recover from these things.