Hear me out:
The only, absolutely only reason why people don’t generally marry on the first date is to figure out whether they DON’T fit together.
So if you manage to figure out that the relationship is not going to work out before you get into real commitments (kids, mortgage, …) you successfully avoided trouble.
I see it so often that people think that dating is already a strong commitment and that ending a dead-end relationship is a failure.
There is no shame in realizing the relationship is going nowhere and ending it.
Dating is the ‘trial phase’ of a relationship. Marriage isn’t required, but the more solid your relationship becomes, the more long-term commitments you’re inclined to make. Ending a relationship that isn’t working for you (and understanding why it isn’t) is the mature and responsible thing to do.