Could I be dirty?

My boyfriend dated his ex for 3 years and he said she didn’t clean herself down there and didn’t take care of herself and been with many many guys before and he never used condoms with her. He never used them with me either and I just found out she had a yeast infection while dating him and had yellow discharge and much more. My boyfriend probably had sex with her on that yeast infection although he won’t admit anything to me about her except all that info. Ive had a papsmar done twice since we dated so does that mean I’m clean? I hope she didn’t spread anything to him but a papsmar would detect disease or any infections etc? I’ve had two UTIs which dating him which I’ve never had before in my life. I feel scared and worried now. He only ever been with her. Advice? Any other tests I can get done? or am i freaking out.