"We"don't make them use anymore than "we" can make them get clean. If love could save an addict, not one of us would be here.
With his history of recovery/relapse/using it is probably wise to stay clear of him. If he tells you he is clean, can you believe him? Therein lies the dilemma, a clean person will tell you they are clean...and a using person will tell you they are clean if it is in their best interest. Actions tell all.
We repeat the lessons until we learn them and say "enough".