Express your concerns: Talk to your teenager about your concerns and explain why you think it would be best for them to end the relationship. Be specific and try to focus on your concerns rather than trying to control their decisions.
Encourage open communication: Encourage your teenager to talk openly and honestly with their partner about their feelings and needs, and to listen actively to their partner's perspective. This can help them to better understand the dynamics of their relationship and to make a decision about what is best for them.
Offer support: Let your teenager know that you are there for them and that you will support them no matter what decision they make. This can help them to feel more confident in their ability to navigate their relationship and to make good decisions.
Encourage independence: Help your teenager to develop independence and self-confidence. Encourage them to pursue their own interests and goals, and to prioritize their own well-being.
It's important to remember that ultimately, the decision to end a relationship is up to your teenager.
You can offer support and guidance, but you cannot control their decisions. It may be helpful to seek support from a therapist or other trusted adult to help your teenager navigate this difficult situation.