My girlfriend said "I love you" and it's a big deal because she didn't believe in it before me how serious is this? What is the next step?

I love her too and it's pretty cool to find someone to love.

Do I wait a few months to propose? Or what is the next step as I don't really get love, marriage, etc?

My girlfriend said "I love you" and it's a big deal because she didn't believe in it before me how serious is this? What is the next step?
Post Opinion