Am I wrong here?

Gosh I feel like I am constantly complaining here but I have come to realize that PC and I have been handed a life sentence of having to deal with our unreasonable and unbelievable ex spouses. I called my ex T to thank him for watching my house and my dog while we were gone to Maryland and I casually ask him if he had anyone over to my house. And he tells me yes, that he had the girl he is dating and her niece over to my house yesterday. Apparently they all met for breakfast nearby and then he invited them over to my house (my house mind you!!!) to see my dog and the cabinets in the kitchen and the granite and the flooring that he had installed. Blah, blah, blah....... I was not very happy about that one bit.
Now I don't know this woman or her niece and she is a stranger and for him to invite her into my home is weird and just not right. Am I wrong here in being mad? He thinks I am. He thinks I have no trust in him and his judgement and I am over reacting and blowing it all out of proportion. Am I folks? After I blogged about the Princess this morning and found all this out, I thought to myself that they really ought to meet each other. But then again, they would probably kill each other. But then again..............hmmmmmmmmmm.........I digress.
After I try to use logic on him and told him to reverse the situation, he tells me that he would have no problem if I brought PC over to his house and he met me there, etc. I was like you are a big fat liar. He did not even want to meet PC or have him even at my house until he was ready to do so and I respected that because he was not ready to even meet him. PC would not even want to go with me to T's house anyways, as it would be too awkward for him and a little weird. Why would she even want to go to my house (our house) to see what we had together? Seriously.
Am I being unreasonable here? Over reacting? In a nutshell, am I crazy? It is my house with my things and I trusted him and he agreed. That did not mean him and the person he is dating. I don't have anything against her, but I think it is a little weird for him to have asked and more weird for her to accept.