First do some research and learn what herpes sores are like. Look up pictures of sores on the internet and compare. The sore starts like a scab, its itchy and uncomfortable. Then the scab opens and it becomes a lesion type of thing. They sometimes look like small whitheads. They bleed and a puss like substance comes out of them. They are extremely painful and they burn when you pee. They last about 1 week. If you have had a canker sore or a cold sore its the same thing. \
The only sure way to know is to have a blood test done on you and your boyfriend. Demand a blood test from your doctor. I had a culture done and it came back negative, but I had it and two years later I had blood drawn and tested positive. So a blood test is the way to go.
You could have gotten it from your previous partner, but its taken this long for the symptoms to come. Some people are carriers for the virus and never experience any outbreaks. Mine took 6-7 months to appear. Or you got it from then man you are with now. He could have it and not know it. Also if you have ever rcvd oral sex from a person with a sore in or on their mouth then you could have gotten genital herpes. Its passed by skin to skin contact not bodily fluids.
Get tested both of you. Let me know what happens. I can help with the questions you have if you are both positive. It can hurt realtionships. I have been there.
Just remember your life will not be over if you are positive.