I know very little about your personal situation so I can only speculate. New relationships are often exciting but that excitement can wear off. In the beginning, you hardly know each other. Perhaps the more you learn about the individual, the less you like about them. In that way, it could be that you’re choosing the wrong people.
It’s also possible that you’re not ready for a relationship. The teenage years are a turbulent time. It’s a time of self-exploration, and so forth. It may be better to avoid dating until you gain a deeper understanding of the type of person you might like.
Because you’re describing a repetitive pattern to your behavior, you should consider counseling. You also mentioned feeling depressed in relationships and that is not the norm. A therapist would be in the best position to answer your relationship questions. Give it a try. Good luck and please take care.
Dr. Kristina Randle