It’s ok and doesn’t look like you were alone. Check out the below and you will find a support group from your E&P peers.
Fear not though, you will see Bane again. If you are not a regular spender of $ or $ for gems to do summons, your only shot at seeing him again would be the daily summons, the occasional silver summon tokens, and rarer epic hero tokens (which can get you 3* too, more often than not), but by far the more reliable way is for you to churn your training camps to level 13 and do the research there and train. That way, you can get yourself chances at 3* heroes (group including Bane, Gan Ju, Dawa, and Kailani) and small chances at 4* (Li Xiu, Chao, Hu Tao, and the highly coveted Wu Kong). Your ultimate goal as far as training is concerned should be to get yourself to level 20, which still gives you 3*, but higher chances at 4* and small chance at 5*.
Who knows, maybe a better yellow hero is just around the corner and you’d think throwing Bane away in the first place was just a short term pain. But if you do come across him again, I’d hold onto him this time around. You might need him for Purple Titans if you are weak at the yellow and he will be a solid contributor for Rare Event Tiers as well as Alliance War contributor.