Do not add is the boy (is) between you and me

Between is a preposition, not a verb, and the boy is the subject. 1. Subject + predicate + object, forming subject-predicate-object syntax. The predicate is generally composed of verbs; 2. Subject + linking verb + slogan, forming The subject expresses syntax, the linking verb is usually be, and the predicate can be a noun, an adjective, a prepositional phrase, etc. It can be seen from this that the above sentence should form a subject + copula + prepositional phrase syntax, so the copula is should be added.