I'm not going to support my boyfriend
Are you sure you're doing the right thing? Are you sure the way you are feeling is the right way to feel?
I'm not going to support that asshole.
Can you explain what he did? It is normal for people to be supportive of their partners.
I don't have to support anyone anymore.
You should support the people in your life. If you feel so strongly you might be better off ending the relationship and break up.