First you should check with your boyfriend does he had some sexually transmitted disease in the past or he is still trying to get rid of something. I don’t want to scare you but this looks like something is wrong. If you don’t want to see your doctor then ask him and hopefully he is going to be honest.
If you experience some other unpleasant symptoms then you will not have other choice than to consult your gynecologist about it.
Sometimes boys can be sick and that they aren’t even aware of it. So if he did transmit something to you don’t be so angry if you love him. And if you want to prevent things like this in future use condoms. They are not only preventing sexually transmitted dieses but pregnancy as well. Keep in mind that nobody is going to take care about you and your body if you don’t do it yourself.