I had unprotected sex with my boyfriend of over a year and he busted/came inside. Then 1 night I was at my friends house... Got carried away with drinks so we had unprotected sex. He didn't come/bust inside or at least not that I remembered... Then a couple days later I had sex with my boyfriend again and he came/busted in me then again we had sex and he busted again!! Now I'm just really scared & confused because I love my boyfriend and 1 night stands do happen specially if you're drinking ! Now the question is... Who's the father!

Impossible to tell.
They ONLY surefire method would be a DNA test AFTER the birth to positively clarify paternity.