These two phrases seem cheesy when someone tells you, but if they mean it and you can see the meaning behind these phrases in your loved one's eyes, then you must cherish them! Because the ultimate meaning behind these phrases is being forever, being the same and consistent all the time! Who doesn't want a person in one's life who loves us the way we are without drifting apart from us? Of course, it is rare but it is possible too. It sounds filmy but even films are inspired by real-life tales, not all films are fantasies right. If you treat love as a fantasy, then yes, one day you can fulfill that fantasy when the right person or people step in your life.
These two phrases connect both past and the future of a bond between people to appreciate the present connection with the emotion of love. How romantic and meaningful it is! But yes, you don't have to fall for these words and the people who tell you these phrases every day just for the sake of melting you down. It's all about showing love, not speaking love. A person need not have to use these phrases to show his/her love, just observe his efforts and her actions, you will come to know how deeply you are being loved by someone whom you love the most. Isn't it what you want? In the world of love, we always keep searching for those blooming emotions and refreshing connections so that our love bond must stay the same for a long period and greedily we expect it stays forever. That's not wrong if you have the right person beside you. But sometimes, that particular right person may visible in the wrong way to you and you may also end up thinking that the right person may be wrong for you. But if you think in the right way, you will get to know what's wrong and what's right. It is quite confusing, right? So do love is, confusing. But these roller-coaster emotions bring you the clarity all you need to believe that your right person can never be wrong.