Insertive intercourse with a man who lied about his status

I hooked up with a guy last night who said he was HIV negative in his profile and through communication said he was ddf and negative on prep. He said last tested at the end of October. I later looked him up on FB and there was a post from 2018 saying he was HIV positive and got his diagnosis a few years prior. It says he is undetectable and how he survived it etc etc. I was on my 4th dose of descovy. Should I be worried or get on pep? What are the chances he is undetectable and just didn’t feel the need to disclose his status since he was untransmissable? I’m like spiraling here