My boyfriend tells me that he has paid somebody (PI) to follow me to see if I cheat on him.

We are expecting our baby in October. I can think of a thousand better things to spend our time on... but he is so insecure that he makes up lies... like he has paid a PI to follow me & take photos. I told him that is a waste of money with a baby on the way. I have asked to see these photos & he refuses to produce them. My conclusion: There is no PI & he is 38-yr-old child!! I will not stop asking him about this BS until he finally tells me the truth.... THAT THERE IS NO PI FOLLOWING ME. HE ONLY MADE THIS UP BECAUSE HE IS INSECURE.