But from what you said, this girl doesn't sound like she is going to be content to have a marriage for time only. She wants the eternal temple marriage and you will be her long term project TL;DR I considered ending my marriage of Save yourself pain by getting out before it gets harder.
So I knew what I was getting into when I married him though I secretly hoped he would still convert back.
We had lots of sex and fun.
But if your faith is a key part of your life, this is huge. My dear faithful LDS aunt married a good non-member man.