It's only love

One of my friends apart ed from his boyfriend,that boy who is a good man and very honesty I have seen ,but she loved other,maybe they still love each other,but they have no efforts to save it,I don't believe they can separate because they have been together about four years,I don't understand why they will select this result,what is love,don't have no forever?I hope she can't regret this choice,wish she be glad and should she can get .must leave it!