I'm going to let my boyfriend throw up on himself
Why would you let your boyfriend throw up on himself?
I hate him for being so self-centered.
You should help your partner if they are sick. It's wrong to just let someone like that puke all over themselves when you could have helped them.
Why should I help? He should have been honest with me.
It's understandable that you are upset with your boyfriend. However, you should not abandon him when he is sick. It will only make your situation worse if you neglect him during this time.