My ex gave me a std twice and keeps lying about it?

I dated my ex for 2 years last year we took a break I didn't see get involved with anyone during our break and he claim he didn't either. When we made up I started having symptoms a month later I thought I had a yest infection but when I went to the clinic they told me I had trichomonas when I confronted him about my test results he went to the clinic he told me he don't have anything he never slept with anyone and insists that i received the test results he denied ever giving me anything for months and i started to believe him when he told me i received the wrong test. Last month I went to get my yearly checkup and I got tested again and I had Chlamydia he denied it again accused me of sleeping around and told me I received the wrong test I broke up with him and he's still telling me he never had a std why is he still denying having a std and we are no longer together?
My ex gave me a std twice and keeps lying about it?
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