I haven't read the replies but will say that this would cross a boundary for me if we were in an exclusive relationship. I did read your second post about her having lunches with the guy. That's a boundary cross for me too. If I am in an exclusive conversation with a woman, I expert her not to be hanging out with guys 1:1, and any text communication should be limited, and definitely not late at night. If she wants to have buddies to text or go have lunches with, she can do all that with women. I would communicate the boundary to her, I would explain to her that I adhere to the same boundaries and would not be texting women all the time and going out to lunches 1:1 with them etc, and I expect the same from her. Any attempt to argue with me about it or say it's not fair would be met with me saying, "I'm sorry you don't agree with me on this but it is my boundary and it is not up for debate. If you don't feel you can adhere to the boundary then we aren't right for each other." I wouldn't engage in further attempts to argue or debate it and would shut the conversation down by walking away and taking space. If she violated the boundary again, I would implement silence and distance until she complied, apologized, and I saw a change, or until I just never saw her again.
My ex wife loved attention and was a little naïve when it comes to men (in some cases - and in other she knew what she was doing). Every. Single. Male. Friend. she had wanted to bang her. They were orbiting and hoping for the chance. She soaked up the attention like a sponge and then acted surprised when the guy who worked in her same office building (for a different company) and went to lunch with 1:1 for months at least once a week ended up professing his love for her and wanted to leave his wife and 16yo daughter to be with her. I'm sure deep down she knew he wanted her but of course she claimed that wasn't the case to me. There were many more examples of this. After she dumped me, she ended up getting together with one of her orbiters for three years. This was all when I was blue-pill and didn't know any better - I let women tell me that telling them they couldn't see male friends 1:1 was controlling and completely uncalled for and unreasonable. 99% of women still tell me this but the difference is, I'm much wiser and understand that their little temper tantrums don't matter and won't convince me that I'm "wrong." You literally cannot be "wrong" with any boundary you have because it is your boundary. You may limit the number of women who will stay with you if your boundaries are way outside of the typical range, but that limiting doesn't mean your boundary is wrong. Men must learn to understand this.
Since I started employing these kinds of boundaries, I find the women I date to become more and more attached to me, even if they try to argue with me in the moment. Women LOVE to feel a man's masculine strength and leadership is one characteristic of this, and when you give them a boundary that they "don't like" and then demonstrate to them that you won't be pushed off balance, you won't change your mind on it, and you WILL walk away if they don't adhere, after they are done with their temper tantrum it draws them closer to you because you just demonstrated your masculine strength.
When I communicate with women in my friend group via text, etc, I usually create a group text with them and their BF. The women do the same. And it's 99% planning logistics, not talking about relationship troubles, bantering, talking about the weather, etc.