Advice

So I’ve been with my boyfriend for a while and he’s been my only sexual partner for a long time. Every time we have sex, the next day or sometimes even a few hours later I get REALLY bad infections (I have to pee urgently every 3 seconds but nothing comes out after the first few times). It clears within 2 days but it happens every time. I’ve always been clean down there, I’m checked regularly. The periods where we aren’t doing anything I never have any issues. I’ve tried to get him to go to the doctors but he refuses and thinks it’s me that has issues. What do I do?! I know it’s not me and doctors have proven that