It depends on how selfish you are. If you are a selfish person then hang on to it because you get more out of the relationship then you put in. If you are a person who is truly honest with yourself and other people then you must be honest with this person. Even if that means hurting them now to save even more hurt in the future. That is the key, a little pain now as opposed to a lot in the future. This is what has to be discussed. You need to tell the person the truth and why. The longer you wait the more damage will be done. A lot of people would think it selfish of you to not stick it out and they are wrong. There is no sense in playing make believe with relationships in that way. You will not be happy thus you end up making the other person miserable too. You must be close to 100% sure that you are willing to commit to a relationship to make it work. Anything less will lead you to sabotage it even if you don't want to, that's the way people are. It has to do with you subconscious and unconscious mind. Unless you make up your mind and stick with it, for good or bad this is the person you want to be with. Even if the love is not as strong, things do change in time and love does grow. When you age your perception of love changes, the adolescent idea of romantic love slowly disappears with maturity and the reality of true heartfelt love that replaces it. The fairy tale romantic and unrealistic expectations we all have in our youth about a soul mate and the one, the perfect person for me, it just doesn't exist. The problem is that so many hang on to this unrealistic view on love and don't know what love truly is. All thought some times people do find this perfect person, I have yet to meet anybody who has found that person for themselves. So many think they have and 10, 20 or even 30 years later the fantasy is shattered with reality and divorce. So many people in this fantasy life never realized that the other person in the relationship was not happy, even to the point of having a secret life away from the other person. You need to find out how you feel and make a decision for the sake of both of you. Especially if you care at all for this person, it's only fair to be honest with them.

Well if you invested so much time and effort in a individual and you are sure that they are your one and only then be with them.But if you are having doubts about being with them then DONT!If you are not sure that you love them the same then you have doubts and if thats the case then you need to find someone you are 100% sure about.With doubts then end it but you take the chance of them moving on.When true love hits then you will know.It is the best feeling in the world!