How do I know I should break up with my boyfriend or girlfriend?

If the relationship is in any way abusive, be it physical, emotional or verbal. A relationship should not continue if there is no mutual trust and respect.

If you don't feel anything for them or if they are hurting you, then you should definitely break up with them.

You should invite them to a lunch date and start talking and tell them you both need to move on from eachohter

You know it when you stop feeling the same way you did before when you two had just started. You just know it.

When you no longer feel comfortable to tell them openly about the relationship, it can get pretty hard without thorough communication . I would suggest that even if you don't always feel that passion you had when you first got together , it died t necessarily mean to break up; but if you feel that things just won't work out and that nothing is benefiting you in the relationship, it's time to move on and open the discussion of the break up

when the pain of holding on is greater than the pain of letting go then its time to let go. Be brave and also do whats best for YOU!

if they ever make you feel like you aren't respected or valued,if they ever make you feel like you aren't respected or valued

You should do it face to face. And trying not to start a fight cause of it. Maybe it could be also good to talk about what to do next and what kinda relationship do you want to have with eachother in the future

For me its like I just know in my core, even if I don't want to admit it. I think that's a kind of knowing that western society or even modern society doesn't trust, but its super important if you ask me in relationships. Also you can watch your intentions around that person -- if they're mostly pure, that's a good sign. But if they're sinister, or manipulative, that would be a red flag to me.

You know if you don't feel happy anymore or if they don't treat you right anymore. Do what makes you happy.