It should be as simple as "timeboxing" relationships. Pick a reasonable amount of time or number of dates that you will see someone before defining "what are we" and "where are we going". Something like 3 months or 16-20 dates. You're not going to learn much more about a person past that. At that point is when you should have a serious discussion and you might break up and move on, or you could friends with or without benefits or you could agree that you want to be in a non-exclusive situationship and you're happy with that. Just timebox it.

One of the main problems with dating is that all the high value people are stuck in these multi-year long term relationships that should have ended much sooner. This ties them all up and prevents them from meeting their proper match which could be determined in a much shorter amount of time. So you really don't want to spend your 20's in a series of 3-5 year so called "relationships" if what you really want is to be married. So don't tie yourself up for years and years, timebox it. Give other people a chance.