I'm also not familiar with querying people about their qualifiers or telling them that Al-Anon isn't for them.  That sounds a little weird and off to me.  There are also many people in Al-Anon who separated from their qualifiers some time ago, or whose qualifiers stopped drinking years ago, or whose qualifiers have passed away.  Those people are just as entitled to be in Al-Anon as someone whose qualifer is sitting down the hall drinking.  We are all in Al-Anon because we are concerned about someone else drinking or being addicted to whatever, and because we want better tools to handle what life throws at us and to handle the effects of addiction in those around us.  Even after we separate from our addicts, unless we get our own recovery, tools, and understanding, we may be in a bad position to handle things coming down the road at us, or to cope with the aftereffects of having been in that kind of relationship. 

Your former relationship certainly counts as the kind that calls for healing and recovery.  If your current bf stays on the straight and narrow, that is excellent.  But also Al-Anon can help with knowing what to do if he should start to drink again, because whether he does or not, it is helpful for us to be armed with knowing how to keep our serenity no matter what happens.  That puts us in a position of strength and calmness.  Al-Anon can help us tell the difference between concern and paranoia (I often used to mistake one for the other and vice versa), and figure out when there really is a problem and what to do if our worries are just making our lives difficult.  The tools have helped me so much that I pretty much thinking everyone on the planet could use some more familiarity with them.  So I would never discourage someone from coming and learning.  And sadly, there are enough alcoholics around that I think we'll all have the chance to practice the tools somewhere in our lives on a real live alcoholic.