Need help.

Hello, recently I had went to the gyno for a what I believed to be yeast infection. When the doctor examined me, she questioned if I wanted to take a std test or get checked and I told her no believing my boyfriend wasn’t doing anything. At the end of the examination the doctor told me I had a bacterial infection and a yeast,

4 weeks later and I’m having another yeast infection... it happened after me and my boyfriend got done having sex.. not to be too detailed, but the discharge is watery and it’s beginning to look built up... what should I do?