Sleeping with somebody who just told me he had herpes. Help me

I'm fucking spiraling. I'm 27f and I just left an abusive relationship and he's the 2nd person I've ever even slept with.

2nd.

No condoms and we've been sleeping together for 3 weeks. He just now told me he has herpes but takes medication and told me that i can only get it during an outbreak.

Please for those who have it understand I'm not judging but I feel sickly scared and angry that he chose to hide this from me

He says my chance of getting it is quite slim to none but I don't even believe him now can somebody tell me if this is true??