So my main plate started acting different/distant ever since we came back from a vacation together in October. The trip went well(probably the peak of our time together) which is why the following baffles me. Basically she stopped texting/calling me as frequently, so I thought okay I guess she lost interest plus she lives an hour away now but the thing is she's still sending out random texts once a week. I tried to get her to hang out a few weeks ago but she said she had work that day and didn't offer an alternative. So basically I think she's checked out of our relationship and she's found someone else, which I'm okay with it's just annoying that she's still trying to maintain contact with me. For example, she called me on Thanksgiving and spent most of the phone call asking about me; she didn't really say much about herself other than thanksgiving plans.

My plan as of now is to try and get her to hang out one more time and if she doesn't react positively then I'll just go no contact. I have another plate but I don't enjoy her nearly as much as the main(and she's not as attractive or interesting to talk to). I don't know if it makes a difference but on our vacation she asked me if I was fucking anyone else and I told her about the other plate so idk maybe that turned her off to me. This plate also came up when she called me during thanksgiving but she didn't seem to react to it.

Are girls just not capable of maintaining interest in more than one guy at a time like we can? It seems like she's distracted by someone else now being aloof doesn't really seem to be changing her interest level. I understand the whole "she's not yours its just your turn" deal but is that the case here or is just a plate maintenance situation?