Dear Tidy,
I don't think that 6 months clean is nearly long enough either for you or for him.
As a general rule, rehabs will tell their clients not to get involved in a relationship for at least one year. The addict needs the time for themselves to work on their own problems - a relationship just complicates things.
My daughter (heroin) ignored this advice and was involved with a young fellow at about 6 months clean - he relapsed and she managed to walk away without any problems.
At roughly 14 months clean she became involved again with another fellow and by 20 months clean she relapsed along with him.
Take this for what it is worth, but I would be very cautious.
One day at a time,
Jim