Did I do wrong? Long read very adult/serious issue

You're all saying the same thing, and I agreed a long time ago...funny thing is, this thread started because I wanted to know if it was right sending her an expensive picture frame since "I don't know her."

The back story I gave, I was just trying to paint a picture of the kind of girl she is, and how we became the friends that we are. It was only supposed to put things into context so I could get a better decision, and I'm afraid people focused more on the 'issues' the triangle caused, the context itself; yes it did, but I never meant for this thread to be about the emotional baggage, or bad women.
Although, the advice I inadvertently gleaned from people telling repeated is priceless, thank you.

And I'm sorry the first question about the item got lost in the shuffle. That's what happens when you give somebody too much paperwork; sometimes, they skim it. What I mean by that is that details were emphasized that I never meant to be, and I was given advice concerning those details alone. That's where the confusion began, and that's why this thread is three pages because I talked too much.

I should have simply asked if giving her such a pricey gift was acceptable, and left her past, and the other girl out of it...but again, I was unsure because I have already done many things for her, as a friend. I thought a fuller story would lead to a fuller decision, you see?

I hope that makes sense now, and thank you all for the help.