Does your partner want you to give up your
collection? If so, he/she is not very
considerate, unless you have been using the
mortgage money to buy cels instead! You don't
have to give up cels just because your partner
has no interest in them. You just can't share the
hobby with him/her, but there's no requirement
that says partners have to share all interests.
My partner is not interested (polite way of
saying "junk") in cels, but he does not care if I
am. His opinion is that if it make me happy, he
trusts my judgement.
You mention having to give up your collection. If
your partner cannot tolerate you cel collection,
you may have a deeper problem in your
relationship, like a struggle for control.