Dr. Tarra Bates-Duford, Forensic Psychologist specialising in familial dysfunction and traumatic experience, Marriage and Family Therapist and Certified Relationship Expert, explains to POPSUGAR that if your partner doesn't ever thank you for doing favours or being a great partner, they're not appreciating you for all your worth. Likewise, if your partner never acknowledges any of your personal sacrifices for him/her or the relationship, it's a red flag, too.