@nevergivingup,
Striclty speaking, if you've had sex you're already married as far as Judaism or Christianity are concerned. Theologically, marriage is established in any combination of 3 ways: giving of a token low-value coin symbolizing the providing for one another (has gone from coin to ring in modern times,) formal contract creation and signing, and sex. Any 1 will do, or combination of all of them.
Downside of this interpretation is only if you breakup and have sex with someone else it's now adultery unless you followed theological procedure for a divorce or 'get' if Jewish. If Christian you're out of luck as according to Jesus you can't divorce.
So if you've been having sex, you're defacto married already.