<human>: Summarize the given text in a few sentences.

Two weeks ago, I had discovered that my daughter had a new boyfriend and asked her to invite him over for dinner so my wife and I could inspect him. To my wife and I's surprise, the new boyfriend was an old employee. "R", was an employee I had working for me a few years ago. I only had him on for 4 months before I let him go because he was unconfident, awkward and near the end of his employment, had tried to challenge my authority a few times. A lot of the time, it seemed his head was in the clouds as well. 

I could tell he held a lot of hatred towards my wife and I by the looks he'd give either of us, if we ever saw each other in public. R had never met my daughter (and I also never mentioned her or my other children), so it's hard to tell whether this is an attempt at revenge or a coincidence. 

At first, the pair of us expected R to act in a way to try and impress us, but the opposite happened. In fact, when it came out that he worked for us, my daughter asked what it was like and he said "I'll tell you later". This concerns me as my workers always saw me as "the boss from hell" because I wanted to run my business properly and that I had called him names and yelled at him when he worked badly.

The fact that he owns a fighting gym and looks like a fighter you'd see at a UFC, as opposed to when he was quite nerdy looking concerns me greatly too.
<bot>: My daughter is a in a relationship with an ex-employee of mine and I'm concerned he's doing this out of spite for my wife and I.