Is it a sin to:
perpetually refuse to marry a particular person
when that person has proposed marriage to you,
if the only reason why you don’t want to get married is that you don’t ever want to marry?
I frame my answer on the assumption that it is you who is “refusing” the proposals, rather than making them.
If you don’t ever want to get married, then we can say you don’t want to get married at the present time.
If you feel
no calling to be married (at the present time), then it is right to refuse whatever proposals might come your way.
If you have a view that you do not ever want to be married,
and you are committed to a chaste single life, then I wonder
how you arrive at a point (in a relationship) where another would propose marriage to you - once, let alone perpetually? This is not to say that you would never go out with a girl, but it ought to be obvious from such outings (given the chasteness of single life assumption), that you don’t seek marriage with her. There is most often a ramping up of all forms of affection, including physical, emotional, etc. in a relationship that is heading in the direction of marriage, and the absence of that ramp-up would send a pretty clear signal that we’re not heading in that direction! So I’m sure you can understand why I am asking my bolded question above!
I note you have posted a number of times on subjects similar to this, eg.
forums.catholic-questions.org/showpost.php?p=10938574&postcount=1 Is there a larger picture you’ve not shared with us, that may help us to provide more meaningful responses?
You have also been asked previously, but not answered (or I couldn’t find it), why you adopt the position of “never wanting to be married”. May I ask again, as the answer may be material?