Does your s/o have a bunch of contacts you?

Dont kno or are unfamiliar with?? I have acess to his phone info and i can see eveyone he calls etc. And vicE versa. The problem is that when i ask him who hes talking to or texting he tells me mind my buisness. I dont know if its a female or male but im just wondering if it normal. And no he doesnt ask to go thru my phone or anything. The one time i had a problem with this one person he was speaking to i didnt kno i asked him about it then called the num it was a girl who said they were friends for 10 yrs but she had a nasty attitute so i screamed on him about it nd he hasnt dialed her num or spoke to her since. I ask him why he said because he not gonna let nothing or noone ruin his family so Shell text him occasionally but he dont answer so i guess since then i been a lil funny about who hes talking to. Is it ok he tells me mind my buisness and to just trust him ????