I'm probably going to break up with my boyfriend soon.
Why are you going to break up with him?
Because he'll never take responsibility for his actions and is ruining other people's lives.
You are right to break up with him if you are unhappy and he is doing dodgy things that are ruining peoples lives. But, don't draw it out too long or you may be sucked into his bad behavior.
No problem.  It gets easier with every fight.
I can see that this has been going on for some time, and that both of you are already aware of your disagreements.  In that case, I think that you are right to break up with your boyfriend and start again.  The sooner that you break away, the sooner things will get better for you.