How should I help my bf with his problem gambling? I'm so sad.

24F. Been dating my bf for 9 months now. He is closest to perfect bf anyone could ask for. I struggle from anxiety and severe OCD and he has been thru it all for me. He never judges me and is so calm with whatever I tell him. I knew that he was using a sportsbetting app but I thought it was just timepass. I recently got to know that he might be tadbit addicted. So at the beginning of the month I asked him to promise me he'll stop. He promised. In return I promised him I'll quit writing on r/OCD since that was fuelling my problem. I never asked him about it after. I thought he actually quit. However today I asked him and he said that he has gone a few times. I feel so hurt and betrayed. He said that he knows he's hooked and is trying to break the addiction by August end but he knows it can't stop in a day. I am so sad. I said alot of hurtful things and even suggested a breakup. What should I do? I want to see him try but I am so scared he'll become an addict. Help me pls.