Would you consider a relationship with an expiration date?

Let's say you can't have kids and won't have them but there is someone out there who wants them and wants to have a family.

You love each other but know that your relationship will not end in getting married and having kids.

Would you still consider being with this person knowing that one day he might meet someone to have a family with and then everything will end?

Would you consider a relationship with an expiration date?
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