Ummm should I be worried

So yesterday my boyfriend's friend, let's call him Steve sent my boyfriend a picture of this girl who Steve has been talking to. My boyfriend hadnt responded. Then the next day my boyfriend's mom sent him a text and he told me to read it to him and when I went to the messages I saw that Steve like a hour ago sent a message that said "damnnn" and curiously I opened the messages between them two and the picture of the girl had been deleted and there was no other messages, just the "damnnn" message Steve sent him.

Like why would my boyfriend delete their conversation unless he said something that would upset me? What could he have said that made Steve say damnn to? And that he felt the need to delete what he said?

Btw I have known Steve for a year and he always says "damnn" when he sees a hot girl. And my boyfriend doesn't care if I look through his messages so don't trip on me.