Depends on the mood and tone of the person saying it in which situation.

Eg. 1. A person who's suffering from guilt in a relationship. When this person would say this cliché to their partner, it could be more due to the person's own guilt which makes him/her feel small in front of their partner.

2. A person who's bored or simply wants to end the relationship with his/her partner, but is unwilling to "dump" the partner. Using this cliché, the person is trying to make his/her partner feel dissatisfaction by implying that he/she (the partner) would fare better had the partner been with another person, often with the motive to initiate a separation or end to the relationship from the partner's end. The cliché works as a verbal "cat's paw" in this situation.

3. A person who sincerely and deeply loves his/her partner but has problems with self esteem, self worth or has feelings of inadequacy. The cliché actually in this situation is a sincere confession of what the person feels for his/her partner.

4. This cliché can be used as sarcasm in some cases. Often by the dominant partner in the relationship, to mock the dependency or clinginess of the submissive partner.

5. Sometimes this cliché can be used to test the loyalty and romantic interest of the person to whom it is said to, especially in dating scenarios.