Some guy on the bus spit out the window and the saliva came back to my face going into my eye. He could have had blood In his saliva. Can I get HIV?

No. I'm sorry people are like that. The risk is zero. In the old days, family contacts of HIV-positive patients just didn't get infected except by sex or doing needle drugs. You can't go through life as a grown man letting this kind of thing trouble you. Worrying like this is like worrying about causing pregnancy by sharing a dip in a pool or a bar of soap. Don't be a slave to such fears.
It would be unlikely. ...but could conceivably happen. If worried, you should get tested.