Do they run from problems instead of solving them?

Is this a common trait amongst people w/ ADD?

I notice it with my s/o.  First it was through addictions: phone, internet, video games.  Now he physically wants to run away from his life.  To another state.  Why do they do this?  Running won't solve problems.  I should just let him go, right?  I am starting to suspect he's living a double life. 

Please share any similar experiences you have.