Consider also if you feel like you always need to be right in a disagreement, if you ever blame your partner for your own behaviours and choices, if you frequently play the victim or martyr role, if you make empty promises, or if you and your partner are in a bad cycle of “intense infatuation, intense conflict, breaking up, not resolving the issue, and then back to intense infatuation,” Fedrick says.
Article source: https://www.huffingtonpost.co.uk/entry/how-to-know-if-youre-the-toxic-one-in-a-romantic-relationship_uk_63060175e4b0e323a25a875d