說好的幸福呢

when this morning i listen tis song , i got very sad de feeling...this song make me recall my 1st love..when we dating , she say how she love me n wat wat...we oso promise live forever..finally?We R break..........who can tell me說好的幸福呢 meaning....were my blessedness? who can tell me.....我懂了 不说了 爱淡了 梦远了