Don't feel obligated to do anything you don't want to do.
Each of us (chooses) our own friends, lovers, and spouse.
If someone is having one bad dating experience after another it's probably time they reexamined their "mate selection criteria".
If you go to the store to purchase an apple but buy an onion instead whose fault is that?
Do you curse the onion for not being an apple? NO!
You learn to become a "better shopper"!
Know yourself, Love yourself, Trust yourself.
Too often people pursue relationships without having taken the time to figure out who (they) are let alone what they want and need in a mate. They allow "impulsive connections" and "happenstance to dictate their relationship choices.
That's the equivalent of going shopping without a list!
The only thing all of your bad relationships have in common is (you).
If you want something different (you) have to do something different.