My sister (mid twenties) met a bloke back in January when she was away working. They were both from the same place but hadn't met before, then ended up living together (with other colleagues) on the trip for a few months. I think they got together pretty quickly, and it was obviously quite an intense start to a relationship. She told us about him when they got back. At first all seemed fine but lately there have been a whole string of things that have got me worried, but I want your expert opinions! Here are three examples...
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she had been invited to an event in the spring (invite issued before she knew him) where there would be single men. It was a once in a lifetime sort of thing and she was going with a whole group of male and female friends. He went on and on at her not to go because he said she would cheat on him, but thankfully she did go, and obviously didn't cheat.
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he went through her FB friends list and said she had too many male friends and made her delete most of them. He then had a huge go at her when he discovered she hadn't deleted an old boyfriend (from 10 years ago)
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my family are all vegetarian and have a no meat in the house rule. He was round at my parents house recently (my sister lives at home) and they were getting a takeaway. He asked could he have meat. Mum said she'd rather he didn't, he kicked up a fuss and stormed off home. Since then when he's been round for a meal, he has sat there and refused to eat their food.
So is he just rude, or is he heading into controlling behaviour? And what can I do to open my sister's eyes? I don't want to let him put a rift between us 