Why does my boyfriend thinks I’m seeing another guy?

I went to go bring my boyfriend something. He first looked at what I was wearing and told me I mustve went to another guys house before coming to see him. Then he sat in my car and told me it smelled like sex and was looking around my car. I told him I was wearing no underwear under my sweatpants (can’t tell) and I was going to the store and he asked me why was I going to the store like that. I had a long shirt that covered my butt. I wasn’t wearing anything special or scandalous.

Why does my boyfriend thinks I’m seeing another guy?
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