I may get married later or may never get married. But I want babies, so I'll have to get married. I want fat, cute babies. Every girl has to think about it at some point. For me, marriage is about family, and that's why I find it necessary. Till then, it's normal to have a partner and do your own thing.
Nobody can predict the future. You just have to give your all to the relationship you're in and do your best to take care of your partner, communicate and give them every last drop of love you have. I think one of the most important things in a relationship is caring for your significant other through good times and bad.