I 36M recently started talking to the new girl 30F at work and we hit it off straight away. We’ve become good friends over the last 4 weeks and have had some really good long chats and met up a few times after work. Those were mostly when her BF (30+M) was abroad.

She soon told me about him and background as to how they met (dating app) over 2 months ago and that she was planning to visit him in his home country while he was out there to meet his family.

Anyway, since he’s returned recently we’ve mostly only spent some time together during lunch break or immediately after work - she introduced me to him briefly a week ago and it was slightly awkward so I cut it short made an excuse and left. He now visits her pretty much every day at work and after work and our time spent together has become less and less.

Effectively I may be in the friendzone but we’ve opened up to each other on a deep level and get on great but she’s also very fond of her BF and has invited him to work often and speaks glowingly about him. Seems like a decent guy but he’s punching above his weight somewhat and I feel like me and her (of same nationality) get on really well and of course I think I’m a better match. I’m not trying to take his girl but there’s come a point now where I’m developing feelings for her that I can’t ignore. And I’m being extra friendly within limits where it’s perhaps quite obvious to her that I’m into her.

There seems little chance of us remaining friends tbh given the increasing restrictions he’s placing upon her and constant checks.

AITAH? Need advice on what to do?

TLDR - developed feelings for a coworker but she has a BF (2months) and they’re moving in together - he’s getting over-protective and may see me as a threat. What should I do?