Question:
How do you know if your boyfriend/girlfriend is the right one for you?

Answer:
God brought the woman to the man in the first marriage (Genesis 2:22), and He brings men and women together today by His Word.

(1) He tells us that the believer is not to marry an unsaved person. “Be ye not unequally yoked together with unbelievers: for…what part hath he that believeth with an infidel [unbeliever]?” (2 Corinthians 6:14, 15). The Lord asks: “Can two walk together except they be agreed?” (Amos 3:3), especially if not agreed about Christ!
(2) The believer is “at liberty to be married to whom she [he] will; only in the Lord” (1 Corinthians 7:39). The expression “in the Lord” is more than being “in Christ,” which is true of every believer (2 Corinthians 5:17). To be “in the Lord” means that both the man and the woman seek to please the Lord. Thus there will be one Boss in the marriage, even Christ Himself.
So the Lord may give you the assurance that your boyfriend/girlfriend is the right one for you if:
(1) He/she shows he/she is saved, by living like Christ (Matthew 7:20).
(2) He/she puts Christ and His things first in his/her life (Colossians 3:1-3).
(3) Your boyfriend/girlfriend is a close friend that you can share everything with (Amos 3:3).
(4) You delight in the Lord, and He has given you the desire to spend your life with that person (Psalm 37:4, 5).(5) “The nurture and admonition of the Lord” from the Scriptures has been your guidance to make this most important decision (Ephesians 6:4).