<human>: My partner and I hit a bumpy patch two years ago and it's been an incredibly long road to fixing it. 

In the last six months, I started discussing marriage with him, and he told me repeatedly that he's not ready, and we need to finish fixing the issues first.

Well, it sucked, but I swallowed it. It's been pretty rough so he made some pretty good points.

Well, unfortunately one night at a bar, we got into a fight caused by a friend getting a bit mouthy, and my boyfriend decided to reveal in the heat of the moment he'd bought me an engagement ring.

I didn't believe him, so I wanted proof, so he had his mother send a picture of it. 

It's awful. I hate it. I specified many times that I never even wanted a ring. I hate wearing jewellery. I'm a horse rider, and I requested that instead of him buying me a ridiculously expensive ring, we build a showjumping ring or a dressage ring on our property. Bad pun, I know, but that was the deal. 

Furthermore, the ring has diamonds on it. I hate diamonds. I have been vocal about my distaste for jewellery, diamonds, the whole lot for the whole time we've been dating.

When I tried to explain diplomatically that we never agreed to a real ring, he said it meant something to him and he expected me to wear it either on a chain or have it mounted in a frame and put it at home. I feel like this is a massive waste of money.

What do I do?

Could you distill the essence of the text into 1-3 sentences?
<bot>: Boyfriend not only bought me a ring I didn't want, it's everything I would hate if I did want a ring. What do.