How can you tell hes going to break up with you?

you can tell when he stops paying attention 2 you or other chicks ask him ot and he starts to not talk to u as much Or sometimes you dont even no anything is wrong then BAM you get hit right in the face w a break up! TRUST me it hurts to get slammed in the face w a break up also they might forget your b day and or ignore u and stare at other chicks or just he breaks up w you