Is it dangerous to date an ex addict?

The guy I’m seeing was released from prison one year ago, and used to be heavily addicted to drugs, Herion was his addiction 9 years ago, ended up in prison for 3 years got out then ended up back there later on that year for another 5 years, at this point he was using pain killers that he was addicted to.
and i don’t want to judge him and he’s a personal trainer now and a great person and he treats me right and even reassures my mom that he will always treat me well but I’m worried and really do have my wits about me...
Is it dangerous to date an ex addict?
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