I didn’t get married until the fourth person I ever said “I love you” to, the fifth or sixth I ever dated. You just keep going until you have grown and learned enough and you find someone you’re compatible enough with.
Maybe it’ll be number three, but it’s also totally fine if it isn’t. Setting the expectation though is kind of setting yourself up for failure. When you simply want whoever is your third love to work out, you may compromise your values simply to fulfill the goal of finding someone, not the right one.