Dude, lemme tell you. Unless you have an equal number of kids as she does, and you two are gonna brady-bunch it up plus possibly have your own ... well, this is gonna cost you in ways that you oughta consider... at least know what you are getting into if you decide to keep this lady.
Do you want to, and/or do you have the resources to, financially provide for this lady's two kids? Let's think, man. Sure, her ole man pays child support, but is that gonna fully cover the big SUV or minivan you'll need to cart around you, her, her kiddos, and the future babies of you and her? How about the extra-big-size house you'll need? That's a whole lotta extra rent or mortgage. Is her child support covering that? Is she covering 100% of that? No? So you are helping pay for her kids, from another dude.
How about family vacations? More costly with her kids. Who's paying for that extra cost? How about road trips or meals out? Who is covering this and all of the extra daily, weekly, monthly, yearly additional costs that are associated with having two additional small humans in the family? Are you contributing ZERO to it? Or are you contributing $$$?
If you are contributing, how much does it add up to, by the time her kids are grown? And how much does that affect your savings? The vacations you can have? Your financial stability? Retirement age? How quickly or slowly are you paying off your car, house, etc?
The thing is, like it or not, marriage is a FINANCIAL CONTRACT between two parties, enforced by a third party - the government.
It's a long life. Ultimately, this decision will only be a little bit about your heart and your weiner. It's mostly about your wallet and the resulting wallet-driven impact on your long, long life as you live with your decision.
But yeah, enjoy hitting that, young man. Sure.