Herpes

I was just diagnosed with herpes and I have so many questions. Please give me all the facts you can.

•When notifying past partners, have far back should I go?

•I got sick with flu like symptoms 4 days after having sex. Does that mean he’s the one that gave it to me? When He’s been my only sexual partner for 6 months?

•if no, how long could I have had it before having my first outbreak?

•He says he’s never had any sores and got tested last year. Could you have herpes without ever knowing it and past it to someone?