CAP - I don't know what kind of teacher you are, but you should know better than to tie all these situations together. It only amplifies your anger & blood pressure. Address each one on it's own merits.
#1) Trans issues - cars aren't human, they're only built by humans and serviced by humans (who aren't always the sharpest blade in the knife drawer- right?)
#2) Babe issue - was great for 8 right? Then the last 1+ been rough - right? Does it come as a surprise there were some doubts? Did you know once a relationship has serious problems the possibility of salvaging it is like 1 in 400? Don't let romance get confused with rational thought. "If the milk in the fridge goes bad - it's not going to be better 3 days later" - OR - "you can't fix a moving train while it's moving" (relationships are always moving and raely stop for fixing - mostly just assumptions of how to fix)
Just trying to help you sort out things to keep things in perspective and not cloud your REAL actual thoughts. (easier said than done - I know)