When the relationship not get well anymore. Just one person who fight for the relationship. There’s no take and give but give and give or take and take for each person. Also if their partners can’t respect and fill the needs of love for mine. The communication not get well, it always lead to a fight. Or we fight almost everyday just because of a little mistakes. Another toxic is when you get mad and choose to silent treatment your partner, or you didn’t want apologize when you did mistakes and chose to guilt tripping nor manipulate your partner. Another sign is when my partner cheated on me or flirting with others while they still have me. And many more.. i thought relationships is about love, respect, communication, affection, and many good or bad things. It’s all about acceptance and be a better person. If your partner make you feel like you’re the worst of person, then leave. They’re not worth the fight. You deserve more than that.