It’s common for Christians to teach that you should only ‘date’ if you have marriage in view. I completely agree. The Bible teaches that there is singleness and marriage; there is no third state called ‘going out’. This third ambiguous category of ‘going out’ does not help us think biblically.
Granted, there’s going to be a period of transition between singleness and marriage; it’s appropriate for a man and a woman to have a period of deliberately getting to know each other. But ‘transition’ from singleness to marriage is precisely the way to think about what you’re doing as you get to know that girl or a guy better.
You can think of it like two lanes on a motorway. There’s the ‘single’ lane and there’s the ‘married’ lane. There is no third lane called ‘going out’.