We-ist

Someone who is in a monogamous relationship who intentionally loses their individuality. They stop using "I," "me," "mine" and only use "we," "us" and "our." We-ism is sometimes used as an offhanded, self-congratulatory way of asserting their lives are picture-perfect because they adhere to traditional monogamous relationship norms.

Jim: "I asked my sister how she's doing and she said 'We're doing fine.' I asked about her, not her and her husband!"
Steve: "Oh yea, she's a we-ist."