How did you know they were "the one"?

Rosie

Hello! I've been with my boyfriend for 3 years now. Over the years we've both grown and learned. I feel like he might be the person I want to marry. We've talked about it and kids. We actually talk about our future a lot. We're both still struggling financially and I'm going to school for at least another 4 years.

How did you know that your partner was the one?