It depends on a few factors. For instance if these are two teenagers or students in college I would say don't rush into marriage or anything along those lines. I'm unsure if this question is related to your situation but I noted on your profile you mention you are only 18.
Although it is "possible" to meet your (soul mate) at such an early age more often than not intense love affairs during our youth often serve as (lessons) for us as oppose to a happy ever after fairytale ending. A large part of the intense feeling we have at that age is due to our hormones raging combined with the purity in our hearts. We're unrealistically optimistic about our future together.
The primary reason is we lack emotional maturity, haven't figured out who (we) are, what we want or need from a mate for a "lifetime", we haven't incorporated reality factors such as careers/work, living expenses, and so forth. People evolve or change in their 20s/30s.
If someone is living with their parents or other provider much of their basic needs are (handled) for them which allows them to concentrate that much more time and attention to their relationship. Essentially young couples are living in a bubble or cocoon "worry free". However once they get a place together and or are responsible for paying rent/mortgage, utilities, car payments, maintaining a job as well as other stress factors those are the real tests that determine if it's a "mature" love. It's very easy to get lost in one another when your primary obligation is school and doing your homework. Enjoy what you have put focus on building your life!