Yeah, I dunno what to say about old relationship energy love. Like when you've been together so long you just, like, share a wavelength. They're on your mind often. Someone who always has your back, when you have no one else to count on - your partner is there with you. When you walk in a room and can already feel that something is wrong or bothering them before they say anything, or you can feel their elation. Waking up to their smell everyday, even the kind of funky morning smell. You really become one... that kind of love is easy to know you should say "I love you" even though at that point it doesn't really need to be vocalized at all.

For new relationships, yeah you just kinda feel it out when it's time. They stop being a fling or casual and start being more, and you're past the sheer infatuation stage too where the whole world sings when you just see them or read a text - although, I guess the world still sings a little lol