[stelles]

First of all, you don't have to tell them if you aren't ready. But if you want to, maybe you could write it in a letter or email and give it/send it to them. This way you won't be interrupted or distracted by their reaction. If you want, you could try to tell them in person again. This might be hard, though.

Just go with whatever you feel most comfortable doing, whether that be by letter or email or phone or in person. Good luck!