My friend said she was "engaged" but I saw the ring receipt in his car

Two weeks ago I was in my guy's car and I saw the receipt for the ring. Small paper from a jeweller in Ikeja, ₦480,000. I didn't say anything. I just put it back and looked out the window like I didn't see it.

The thing is, she's been posting "my king" and "God did it" on her story for months. And I'm there liking the posts. Liking. The. Posts. Because what do you say? "Congrats, I saw the receipt, he bought it two months ago and has been sitting on it"?

Now I'm carrying this thing in my chest like I stole something. Every time she calls me to gist about wedding colours I just say "mmhmm" and change topic to zobo. Am I wrong for not telling her? Or is this one of those things where you just mind your business and let God handle it?