I believe what happened is a very clever scam technique that I have previously shared here [1]. The scammer likely gathered enough information about you and managed to create a group chat where both your account and the original account of MinorJones were added. The scammer then named the group to make it look authentic, leading you to believe you were speaking to the correct person, but unfortunately it wasn’t him. 

I don’t blame anyone except the scammer, who was cunning and manipulative enough to deceive you. However, you should take responsibility for what happened and use this as a learning experience (harsh lesson). I recommend contacting MinorJones on the forum via DM to confirm his identity on Telegram before the transaction happens, you could avoid it this way.
There are many safe methods for verification. I also advise taking a look at the topic I shared, as it might help you better understand how this scam worked.

[1]: https://bitcointalk.org/index.php?topic=5449834.msg62134453