Alliance with Nellore city girl from Andhra broke up.

I am from abroad, and got an alliance from Nellore. This happened last year 2024 June first week. I spoke with a girl a lot of times and we proceeded with the alliance. I came to August for my engagement. Everything went well and we followed what ever they asked for. In fact we gave 6 lakhs of gold to them on engagement day. My father only asked her one thing that I and her need to grow up together and try to live separately in future, because my dad plans to retire and come back to India, and my mom passed away few years back. In fact lot of my friends whoa are married live separately away from thier parents. The girl family didn't like this, and they cancelled the marriage. They don't want to return the gold we gave to them and they are saying "we already spent 10 lakhs for engagement". The girl didn't bother to message me no calls after discussion with my dad. We felt bad that marriage got cancelled, and she didn't properly explained me well.