Why did women at my office approached me so aggressively after I got into a relationship with a colleague?

tl;dr why was I being approached so aggressively when i was in a relationship and when I was single nothing really

This was really odd for me, I had never been so directly and aggressively approached and not by one but three girls at my workplace some months ago and it still dont make any sense.

I 27M got into my first serious relationship last year and we both met at work and before that even in my office, I was friends with everyone but after my female colleagues saw how i treated my now ex, one of them said I like the fact that youre so loud and proud about the one you love and at the same time she told me how she thinks my girl is not good for me and asked if i know guys like me in my circle,

then another one literally took my phone from my hands and added me on her ig and told me my gf isnt pretty😭that was fkn rude the third and last one was actually her friend insisting us to go out for lunch twice and saying she doesn’t thinks its worth going out with her and how she talks about buying expensive clothes but has cheap ass phone, my girl was religious and we are Muslim so I wasnt allowed by her to make it public so she asked me not to defend her as it would make it obvious and I listened and distanced myself from all 3 of these colleagues. the last one was acc her friend that I befriended to get close to my girl when we started talking.

now this is where i dont understand, if i as a man liked someone and see that she’s in a relationship, I would back off right away but when I was single I was never approached like this, the second girl acc tried to get me transferred to her department😭😭 and 3 girls in one month like that was shocking to me, I only told my girl about the cheap phone thing and she was heartbroken so I hid the details but she knew all the 3 girls that approached me not what they said bcz it didny go well the first time.

Only one question, why go after a man that is already committed? The same man when he’s single is barely approached by anyone, they even called me grinch before and after I got with her, my work besties said its like someone put a hanger inside my mouth bcz i was always smiling and laughing. After we broke up, the same besties said I was compromising on my self respect for her and we had 1on1 conversation with my girl back then that I think she has less respect for me because I let everything go and dont set boundaries and she said maybe

These were not girls that give off bad vibes, these were the nice, low key, soft spoken types so it really did add to my shock

Short summary TL;DR tl;dr why was I being approached so aggressively when i was in a relationship and when I was single nothing really