Herpes?

Okay so I’ve only had one sexual partner and we’ve been on and off for 4 years. Some time back in March he went off with another girl for 2 months. She said she was a virgin and that was he’s second sexual partner. We got back together in June and last week I got diagnosed with genital herpes. I don’t know if I have it in my mouth either. My partner has never shown any signs or symptoms. He’s never noticed anything unusual and I think he assumes I’m the only one that’s got it. I don’t know what to do? He must have got this off he’s other sexual partner. Do we forever use a condom while having sex? Could i ever give him oral sex without protection?