porn addiction

my fiancé admitted to me a few days ago that prior to the start of our relationship of three years, he'd struggled with an addiction to porn. he didn't say whether or not he still uses porn now, but he did say it's still something he has urges to watch. he wants to stop use of porn entirely and said he's tried all on his own and kept it from me because he didn't want to make me feel bad, which i believe and understand. what are ways i can support him as he goes through therapy? we are long distance (which will end in august) so would sending him nudes/videos of myself to replace the porn be helpful or would that just make it worse? thanks, i just want to help him.