Old English betwēonum, from be 'by' + a Germanic word related to two
In standard English it is correct to say between you and me and wrong to say between you and I. Why is this? A preposition such as between should be followed by object pronouns such as me, him, her, and us rather than subject pronouns such as I, he, she, and we. Thus it is right to say between us or between him and her and it is clearly wrong to say between we or between he and she. The mistake between you and I arises from a confusion between what follows a preposition and what ordinarily comes at the beginning of a sentence. Many people know that it is wrong to say John and me went to the shops and that the right wording is John and I went to the shops- after all, no adult would say me went to the shops. Some people assume that ‘and me’ should in all cases be replaced by ‘and I’, and so in trying to avoid one kind of error create another one.