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First off, this comes off a little paranoid. You're assuming that because you are into her everyone else is too. Maybe this senior citizen uses leather working as a way to meet women (after all, you say he has done this before). Isn't it more likely that this is not the case though? After all, if he teaches this stuff trying to f-close every woman he teaches he's going to ruin his business. He may also just be a lonely old man who is looking forward to a (non-sexual) companion. The possibilities are endless, but I'll assume you have information you didn't share.
Take an interest, be excited for her and, FOR GOD'S SAKE, do not act like a jealous AFC. If she thinks you are threatened by an old man you send all the wrong signals. No woman wants to be with someone who is insecure, they want alpha-males. If you just stop talking to her out of nowhere she's either going to see right through you or think you just aren't interested.
I'm not sure what your relationship is like with this chick, if you've already been LJBF'd; who cares, move on. If you're dating her say it sounds cool and you hope she learns alot, and that you want to hear all about it when she gets back. While she's gone post status updates that make it sound like she's missing out on great times by not hanging out with you like "Great night, last night. Lot's of fun and laughs, I can't believe (random guy friend's name) actually did that last night... Wow". When she gets back and wants to hear about all the fun times just say "Yeah, it was alot of fun. Nothing any more memorable than the usual shenanigans though". If this is someone you like, but have no real history with write her a letter saying "Leatherworking huh? That's interesting, you'll have to show me your skills when you get back".
In general, it sounds like you're worried about nothing. She's interested in Leather working and wants to learn more. She wants to learn from someone credible so she is going to learn from this guy. The chances that this guy is some mPUA that's going to charm her out of her unsuspecting pants is so miniscule you'd be better off worrying that Brad Pitt or some famous sex symbol is going to show up at the same time to learn leather working too. Or better yet, just don't worry about anything.
Yeah after I wrote this I realised that I was being a paranoid dickhead.. I did respond wishing her to have a great time asnd to check out some of the cool stuff she was going to bring back.
Jokingly told her to watch out for the guy and that's we'd catch up when she gets back so and hassled her about picking up cowboys while she was over there.
Anyway Thanks for the kick in the arse..