I have read some of the comment here and would like to share my experience. If you and she are not sealed, your children won't be sealed to either of you. It sounds like you have found a good one. If you have any questions about Mormonism doctrine or things or other angles on what she says feel free to message me. I know many of you understand how Im feeling and a lot of you have been there for many years already.
By the end of the first date with my husband I knew I wanted him to be a part of my life. Something that will help you stand out is a strong masculine frame. After our child was born, I can say that my resentment of my husband started to grow and overshadow the respect I have for what he does. To me, the core question is, is this person inclined toward self transcendence are the inclined, desirous, self aware enough to be selfless. I understand your internal conflict completely and my heart goes out to you. Because she will think that all of a sudden she is going to hell for being human, that's mormon sexual repression.
Those will make her think. Propagandists in the media throw around the word patriarchy as if it is synonymous with anything male. It MAY be true that she will be miserable with him and make him miserable with her. It sucks to admit, but I broke up with him after 6 months because I didn't think there was any point if we couldn't be together forever. I guess the only risk is your husband having an affair with someone at work.
I got to thinking about how I and others in my ward might react if a same sex couple attended church and how those views might WILL, fingers crossed change over the next decade. While it's true that Mormons are not one-dimensional and completely predictable, the odds of a successful relationship, given the OP's description of his girlfriend, are slim. I read through a few of the LDS.