<human>: Condense the text into a few key points

I'll make this as short as possible.

I (25M) love my girlfriend (25F) of 4+ years, but I'm bored. I'm at a crossroads in my life, where I need to ask her to marry me...or move on. Until a few months ago, I was convinced she was the one. However, I've recently identified a few things which concern me:

- We haven't had a fight in the last 4 years...ever (don't healthy couples fight?)
- Sex is stale, boring, routine, and infrequent (everything in /r/deadbedrooms resonates with me).

There's one more thing; we have no mutual interests. She's into things a, b, c, d, and I'm into things e, f, g, h. I'll do things a, b, c, d with her even though I find them very boring, because it makes her happy. However, she won't do e, f, g, h with me, *even if I ask*. There's no consideration at all.

These things are making me to fall out of love with her.

I always thought people got married because they wanted to settle down, have kids, start a family. The type of person she is, she would be a great mother to our kids, and be able to provide the "stability" and the level-headedness I envision a family needing.

Is marrying her because we would have a strong happy stable family... a terrible idea? Am I ridiculous for falling out of love with her, just we don't share mutual interests and she won't partake in e f g h?
<bot>: 25M <3 but bored with 25F. All the "right" puzzle pieces for a good family. Marriage - good or terrible idea?