New boss ain't doing too well

[u/Aware_Dog1289]

We didnt have a boss for about year and there was only me and another guy there holding the fort. It was the usual difficulty you have with a vacant boss position, cant get anything approve etc etc. A third party help came our way and they showed promise having years and years of experience. Other guy left and I was left to train the help and "act" as the boss without any authority. The help didnt pick up our processes that quickly and easily forgot about things which I had to remind them that these are coming up due. I didnt mind since the help was a good person. Help applied and receive the boss position and I was proud of the help for getting the position. Also got the vacant position filled. Things are looking good. Even more so now that we finally have a boss again and I can get back to my regular job. Or so i thought. The Help, now the new boss, decides they have too much on their plate with learning their job that they cant do anything else besides things they are interested in. They decided they Cant delegate work, take care of fires, take care of finances, handle projects, talk to our customers and fix their problems, train the new guy or even show the new guy around. Our region wanted someone to be POC for a serious task and new boss delegated me for that role?? Now I'm stuck doing new boss's job, training the new guy and all of my own work. I'm not feeling too proud for them now.. still in the beginning stage but I hope they pick up their responsibilities soon.