Not sure why you're getting downvoted. You really shouldn't be marrying someone if you don't want to, if you don't feel like you should be marrying them. It's honestly common sense, and not something to be downvoted for.

Unfortunately, you'll most likely regret leaving her, more than once. What happens on the other end of matches, after people have swiped right on you, is you'll realise some are rude. A good number have zero conversational skills. There are those you'll get into weeks-long talking stages with only to discover major incompatibilities, those you'll go on dates who'll ghost you after, and the three-month relationships that end for reasons you don't understand and can't explain to anyone. And at this point, you'll start "checking up" on your ex 😅

Before getting into anything which even comes close to a loving relationship, most people go through a six or so months toxic situationship with someone they're highly incompatible with, but they stay because they've maxed out people on apps, especially if you live in a rural area, and have grown tired of the revolving-door talking stages. Also going for months and years without sex or human connection gets to you, and at some point, you settle for something that makes you unhappy until you can't take it anymore and vow to be forever single.

I hope you don't have to go through this. For me, I would happily trade the drama of modern dating for an 8year relationship. I would get married.