If you have HSV1 genitally, you got it via oral sex. If your current boyfriend is the one who performed oral sex on you, a few days before you have this blister, then he is your source. Which means, he has HSV one and you’re not going to reinfect him. He already has it. You can’t give him something he already has.
If this is a new boyfriend and not someone who gave you oral around the time of your outbreak, I still think you’re panicking for no reason. HSV one on the genitals sheds infrequently. If you want some reassurance, you could go on suppressant medication that a would help minimize shedding.
You could very well have a secondary yeast infection, that can happen. Do you want to get prescribed Diflucan tell cleared up.