I started a friends with benefits back in the end of May. Things were going great until school started. He started to become more distant to which I took it as school and work can make you busy and I understand that. Now, I'm 99.9% sure he's sleeping with someone else because we don't communicate like we used to. When I asked him if something happened, he told me he's just chilling and it's none of my business so don't worry about it. I try to make plans or send a flirtatious text and he completely ignores them.

Should I confirm my gut feeling of him sleeping with another girl to him or just end it completely or both?