How to end things?

Recently tried to get back with my ldr after a few months apart. Hindsight...probably a bad idea considering why we ended things anyway. But rhings have just been..off this time. It doesn't feel right, we barely say I love you, he disappears for hours and really doesn't seem to consistently care.

Honestly, I love him but I can say that I'm probably not in love anymore. I'd like to end things before it gets too bad. Keep the good memories and move on for the both of us. Ive never broken up with anyone before...does anyone have any advice? I really want to make this as peaceful as possible