In today's Gospel, some Sadducees give Jesus a hypothetical scenario where a woman marries seven brothers, one by one.
They ask Him which of the seven will be the woman's husband at the time of the Resurrection.
Jesus' answer, in essence, is that marriage is an earthly thing. It is not "needed" in a Heaven without death - one where our relationship with God is paramount.
This is hard to comprehend, especially for married folks. But it is fair to say that we are just not capable of fully understanding these kinds of things yet.
I equate it to when we were young children, and the thought of marrying someone was "gross". We just didn't have the capacity at that time to appreciate how wonderful marriage could be, just like we do not now - at this point in our journey - have the capacity to fully appreciate what happiness in the Eternal Paradise is like.
Hopefully some day we will, and it will be more beautiful and amazing than we ever thought possible.
For now, we have Faith.
God Bless you.