So, I have my main cat Danna, but there was a gorgeous black cat that likes to come inside to play with me. I've known him for the longest time now, but I thought he was just a stray cat. He always liked to be outside but everytime he saw me coming from work he would come inside my house to play with me. One day I noticed that he was getting all the (females) outside and I didn't want him to get them pregnant. I grabbed him and took him to get his shots, neuter, and dewormed. I was also thinking of taking him when I move from here. I thought he was outdoor/indoor cat because he comes inside the house but gets desperate to go outside. He is very friendly and I love him, but today he came to my house with a collar, with his name on it and a phone number that means he has a house and it is the property of someonse else. I spent all that money on him, and he will not be mine. Well, at least I neuter him lol. His name on the tag read...Spartacus Rodrigues, and according to me I gave him the name "Blackie" what should I do? He came to my house and wanted to get in and I did let him in to play with me, but now that I know that he has owners I think I should not let him in my house no more. What do you guys think?