It's heartbreaking to hear that you're going through this. I can see that others have already offered you valuable advice, and I'm here to build on this by offering my own.
The first thing I'd like to say is that unemployment does not equal failure. You're not alone in this - I quit my job during the pandemic too because I simply wasn't enjoying it and felt as if I deserved to be treated better. Think about it this way - your job didn't fit in with your lifestyle, and that's okay. Have patience and persistence, and you'll find the right job soon enough.
I'm so sorry to hear about your breakup. There's nothing to feel guilty about - even if you don't believe that your experience fits the descriptions of trauma that you may be used to, different experiences affect us in different ways, and your feelings about this situation are completely valid. You should also never feel guilty about setting standards and boundaries. It sounds to me like he was gaslighting you, calling you a "psycho" and an "overreactor". There's an old saying that "you have nothing to fear if you have nothing to hide", so deleting text his conversations doesn't make sense unless he's trying to cover up something, like a conversation with another woman. This is not at all your fault. If you look at it this way, you're now out of a toxic relationship where your feelings aren't being respected or heard.
You may find value in seeing a therapist or psychologist and discussing your feelings. Sometimes it can feel great to just get some things off your chest, or talk to somebody who will listen to you. As somebody who was initially scared to see someone, I have no regrets about my decision to seek help.
Please don't feel like you're a waste to this world, or that you're victimising yourself! I know so many people in university who still don't know where they want to end up after they've finished their studies, so there's absolutely no pressure, and not knowing doesn't make you any less valuable than people who do have some kind of plan. Plans change anyway, that's the nature of life. You will always be enough, and there is always somebody in this world who cares about you and will look out for you, like the people on this forum. We're here for you :)
All the best, SB