Think positive. Can try think out of the box. Why not you work harder instead of leaving ? Now is Sept, end of the year leaving is just like declaring war with your bonus which is money, not a wise choice if I were you. There must be a reason why he left you. However, just move on. Hate him or what, up to you. My way of coming out of this mess is try to outperform him which is concentrate more on work. Good for career, even better to get over a dead relationship. Why should you avoid facing him ? You scared ??? You weak ??? I thought you said you're independent ... means you should always think " your loss is my gain ". You should have this kind of motivation.

Maybe now end of the year, just take a week leave and go backpacking somewhere, but don't avoid problems. That is for the weak. You will never grow if you keep avoiding problems.