How can I prove that the bed bugs are not our fault and they were in this dwelling before we moved in?

Question Details: We have been here for 2 months. I mistook the bites I have as flea bites. We finally caught the bugs crawling on my pillow. Oh and yesm bed bugs can get into a hard side full waterbed mattress. My landlord is telling me it's my fault. I was starting to get bit up almost immediately after moving in, however as I said I mis took the bites to be fleas. So, how do I prove that these pests were here and I didn't bring them in?

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