The marriage relationship is contractual, and the relationship between Christ and the Church mirrors that contractual relationship.
An example from modern life:
A loan contract for purchase of a vehicle: the lender (the bank) offers a contract. It is accepted by the borrower, and memorialized by the signing of a contract. The contract has conditions. What happens if the borrower stops paying? What happens if the vehicle is sold? What happens if one party wants to end the contract?
Marriage is a contract. The contract is offered (Will you marry me?). The contract is accepted (Yes, I will). The contract is formalized before witnesses (I do. I do, too).
And so Christ offers a contractual relationship to his church (Will you be my followers?) Many of us have accepted the contract (I believe, I accept Christ as Lord in my life). The contract is formalized (We receive spirit within, and are born again).
Jesus is described as the Bridegroom, his church is described as the Bride. A contract relationship. Jesus’ relationship is with his church, not with a denomination, not with just one group, not with just one sect. His church is the entirety, all of us, no denominations, all are accepted by him.
And there is an exclusivity inherent in the relationship. When we marry, it is to one person “till death do us part”. When Christ beholds his church, he sees no other. There is only one church for Jesus. If we are unfaithful, he is not. If we see divisions, he does not. If we abandon him, he does not abandon us. For Jesus, there is no end to the contract, no end to the relationship with his church. Just as the marriage relationship is exclusive (one man, one wife) so is the relationship between Jesus Christ (the Bridegroom) and his church (the Bride) exclusive. Jesus does not see denominations. He does not see divisions, disagreements in doctrine. He sees his church, the Bride, one entity. For him, there is no other possible relationship. The church should see only Christ.
The marriage contract is supposed to be exclusive, just as the relationship between Christ and his church is exclusive. In real life, marriage is often flawed, for we are frail, and our frame is dust. But the relationship between Christ and his church is absolute. For Christ, there is only his church. If we fail to live up to His calling, we still are his.