The phrases you mentioned ("you deserve someone better" and "let's stay friends") are often used in certain situations where one person wants to end a romantic relationship but does not want to cause unnecessary hurt or discomfort to the other person. These phrases have become somewhat clichéd because they are seen as ways to soften the blow of a breakup or to express that the person ending the relationship doesn't want to take the blame for the breakup.
"You deserve someone better": This phrase is often used to convey that the person ending the relationship feels inadequate or unable to meet the expectations of the other person. It is a way of saying that the other person deserves a partner who can fulfill their needs and desires more effectively. It can also be used when one person is dealing with personal issues or insecurities and believes that the other person would be happier with someone else.
"Let's stay friends": This is a common phrase used when someone wants to maintain a connection or a level of friendship after ending a romantic relationship. It can be a way of showing that the person still values the other person as a friend and doesn't want to lose their presence in their life entirely.
As for the phrases you suggested ("you're too good for me" and "let's stay together forever"), they are not as commonly used in the context of a breakup for a few reasons:
"You're too good for me": This phrase may imply that the person ending the relationship is not worthy of the other person, which can be seen as a self-deprecating way of ending the relationship. It could be perceived as an attempt to gain sympathy or to avoid taking responsibility for the breakup.
"Let's stay together forever": While this phrase expresses a desire for a long-term commitment, it's not typically used in a breakup scenario because the whole point of breaking up is to end the relationship. Expressing a desire to stay together forever would be contradictory to the decision to break up.
Ultimately, the phrases used in a breakup conversation can vary depending on the individuals involved, their communication styles, and the specific circumstances of the relationship. It's essential to be honest and considerate when ending a relationship, but the way in which it is done may vary from person to person.