No one is immune from other people's influence. Everyone is susceptible to it to one degree or another.
Someone might be too accommodating, someone who can't say no. This person will likely be taken advantage of, which he or she doesn't want to allow.
You don't have to bring the situation to the point of absurdity, don't become subordinate to everyone. There are work councils that won't allow this to happen.
Analyze the reasons
When did selfless help become the norm? When did it start to be used? Who does it and how often? It is necessary to answer such questions in order to develop a behavior strategy.
It is also worth considering whether the use is such. Everyone has their own understanding of this definition, since everyone has different boundaries.
Watch your words
It is recommended to be aware of the speeches you make. But in the case of manipulation, you need to watch someone else's language. If there are many compliments, if there is no end to the praise, then you should be wary.
In this way, the interlocutor can simply lull vigilance. If after flattery a request is made, it would be appropriate to refuse it.
Don't be fooled by apologies
They can be fake, which is not uncommon. Someone who is used to manipulating easily asks for forgiveness.
But next time such a friend will act in the same way, not caring that it hurts other people's feelings.
Know your worth
Those who love and appreciate will always do so. There is no need to seek the favor of truly close people.
And the manipulators will need to be pleased, you will need to bend over backwards for them. And this will only help for a while: they will be benevolent as long as their orders are carried out.