What should I do if another woman is putting a strain on my relationship?

My boyfriend of almost 1 year has a female friend that he has been increasingly getting closer with over the past 5 months. From the first time he met her, I have been very clear that I was uncomfortable with them becoming friends. She was my coworker and made my largest project impossible to finish so I was already annoyed with her. And there were some situations between him and her that made me uncomfortable. It also doesn’t help that she’s exactly his “type”. Over time, they’ve been texting more, she invites him to places (just him, not in a group), and she has him on private stories on social media. Every time something involving her happens, I express that it’s fine if they’re friends (since that’s already established) but it makes me upset that they’re getting closer. We had an argument and he told me he doesn’t want to stop talking to her because he cares about her and doesn’t want to hurt her feelings. Hearing this made me feel like I’m evil and controlling but I have this horrible gut feeling about the situation. I try my best to be understanding and fair but it brings me so much pain because I told him for months how their friendship hurts me and he continues to deepen his connection with her. He has so many friends, women and men, but it’s JUST HER that I’m uncomfortable with. How do I even handle it before it becomes a breaking point? Am I being unreasonable? He’s a great partner but this is the one thing that is causing problems between us.

What should I do if another woman is putting a strain on my relationship?
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