this song is pretty much about a guy who's always been afraid to "give his heart away", or say things like "i love you" because he doesn't like to be vulnerable, and he doesn't want it to go to waste, doesn't want to give his heart away if it's not going to last (maybe he doesn't want to get hurt)... but then he finds this girl who he likes, and he doesn't really care any more whether it's going to last or not, because he's fine with just feeling that little bit of happiness
this song is pretty much about a guy who's always been afraid to "give his heart away", or say things like "i love you" because he doesn't like to be vulnerable, and he doesn't want it to go to waste, doesn't want to give his heart away if it's not going to last (maybe he doesn't want to get hurt)... but then he finds this girl who he likes, and he doesn't really care any more whether it's going to last or not, because he's fine with just feeling that little bit of happiness