Your legal obligations stop at the lease agreement. You must pay for whatever you agreed to pay for in writing.
Morally, you have a duty to act in good faith and fairly to your roommates. Give them fair notice and uphold your part of the lease and any "gentlemen's agreements" you've come to. But, beyond that, you don't have an obligation to worry about how they'll manage when you're gone..
If your worries are based on how comfortably your flatmates will be once you move out you can inform them of your concerns, have them attach a financial amount to their discomfort and then give them that amount until such time you feel that their comfort is no longer your responsibility. Or you can respect that they are adults and responsible for their own comfort.
If your potential roommates are not financially stable then you should worry. If they stop paying the rent or skip out you get screwed.
No. Nothing I could say will ease your worries. Best of luck.
I have more than enough financially to live comfortably but I'm not sure the flatmates I'll be moving out with will. It's a great house it's actually pretty cheap but we are all students and it'll be a little harder to travel from where I'll live. Is there absolutely any advice that I can get that will help ease any worries I may have?
Thank you