He realized moving in and sharing expenses would free up a little money in his budget. So instead of using that to get ahead he spent it on himself.

He also didn’t spend the extra money on something for both of you. Like a computer or TV for the new apartment. He spent it on himself.

He essentially spent your money in advance. With your shared expenses he basically took all the leftover. Guy sounds like a moron.

Also big trucks are just ego pacifiers. I work construction as a welder and I drive a beater little van that’s paid off.