Yes as you will waste valuable time with something that probably will end anyways. Use that effort in something that will be lasting.
when you're in your 40s yes. because neither of you is likely to change
depends on how long, you don't want to keep TRYING for the rest of your life.
connection is what draws you to another person and keeps you there; if that connection is lost, or it's only a one-sided connection, then there is no longer quality in that bond.
No not at all. Just try a different technique