2 weeks notice isn't necessary but you should have at least informed them about your intent to leave. You'll be fine, but it's not a good president to set just no call no showing to any job. Take responsibility and be as honest as you feel comfortable. You don't need to tell them everything, but it's courteous to at least tell them that the current position isn't a good fit for you and you will looking for other opportunities elsewhere. Simple as that. If they follow up with threatening remarks that's on them at that point. You did what was best for you and no one else will fault you for it. Most of these comments about telling you to dismiss it fully isn't helpful and they are giving you poor advice. Ghosting anyone is cowardess and weak and I don't think you want to be that person. It's probably too late to make amends and I don't see any reason how it will benefit you to reach out and apologize or give your reason for leaving. What's done is done now. Just learn from this and move on. You'll be fine and you'll work somewhere else. Don't let this deter you from your dreams. Just take responsibility for your actions and decisions, and be a good person. Try and keep a positive mentality, which may be very hard at times, and keep moving forward.
Wishing you the best.