Why did he think I was lying?

I'm a 24 year old female. I have a close guy friend who's also 24. I was supposed to hang out with him earlier this week but I cancelled due to having a miscarriage. I told him I was going to stay at home until I was better.

He was nice to me at first but, two days later I posted on snapchat and I was with my female best friend of 14 years and my family at our campground. He saw this snapchat and it caused him to think I lied about the miscarriage to avoid him. I tried to explain it to him I didn't mind them seeing the bleeding but I was uncomfortable with him seeing it because he was my guy friend. I couldn't convince him even after I made it visibly clear how hurt I was. I finally sent him pictures of my ultrasounds and he finally let it go after that but I don't get it. Why did he think I was lying? We've been friends for 6 years.
Why did he think I was lying?
Post Opinion