How do I get back at my (ex) boyfriend for cheating?

So this summer i went on a long vacation. My and my boyfriend got into a fight when i was on vacation. He could have went on vacation with me but instead he went with some "old work colleagues" on vacation to a different country. We barely spoke when i was away. After i came back from vacation. We were again not on good terms for some days. But now we acting normal again. Havrnt had sex yet. So today i found viagra pills, empty box and a doctors note for a std test in his car. The date on the doctors note was some days after my vacation, but i hadn't seen him yet. Also we usually use a condom, for the 3 years we"ve been together. I also found a bill for a fancy restaurant and it said 2 guests. So him and someone else. Its the same place he and I always went to. The weird thing was that the same night he was calling me and texting me wanting to have sex. So probably he went on a date but didn't get sex so he texted me. I didn't accept his offer. I dont just want to have sex if we are not on good terms. Now i haven't said anything about it tp him yet. Do i cpnfront him about it? What should i say? And how do i get back on him. I need help

How do I get back at my (ex) boyfriend for cheating?
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