Im not Gay, But Im SO in love with my best friend?

We started hanging out in 11th grade im 19 and out of school now. Hes like my brother but I fell in love with him to the max! is that bad?? i mean i get butterflies when he even touches me. But do we have benefits?? because hes straight but weve had sex. lol. Oral sex and we even kiss sometimes!!!! i mean he makes me so happy and i love him!! Please just give me some advice??