You are so kind to take over some task when others are busy, your thought is only to help and support each others.
However, people will assume this is your responsibility when times go and forget what had happened in the past. Perhaps, they might even make a complaint when you can’t perform the additional “task” on time.
How do you feel?
Be gratitude, nothing is a “Must”.
Yes, as a Buddhist, we are practising “Compassion and loving kindness”. Please also use our wisdom when handling things and situation. Be brave and bold to tell the truth.