I feel like this is a common scenario.

You’re dating someone for a few months, things are going well! Then, he asks you to be his girlfriend. You two get a bit more serious.

.. and now there’s a sudden drop in effort.

It’s easy to weed out guys that are low effort from the very beginning, but I am having a hard time understanding this.

Is there a way to avoid these kind of men? Or is this just the cost of dating?