<human>: Can you summarize the given text in a few sentences?

I met this girl early last year (Her 30, me 26), she was still with her previous bf who she has 2 kids with (ages 2 and 3), she was off limits. Eventually that fell through (she moved out) and a few months later we kinda floated together and hooked up.

I talked with her about the situation and we both said we didnt want anything serious. Things were going ok, we'd hang out, talk most days, I felt important, I was content.

The last few months during the Holiday season, I started feeling less and less important. She started being distant, not answering my texts for hours, the only time she really seemed to want to see me was to have sex, and she was spending a whole lot of time at the kids home with her ex.

I can see she might be trying to get back together with her ex, which I almost support (for the kids).

After weeks of feeling unimportant I finally got upset enough to tell her last night when she flaked on me for our New Years plans. She said she was doing her best and means well. (She was at the kids house and I assume her ex was there as well)

I dont feel thats a very valid excuse, nor do I feel our relationship is anything short of me being her mistress. She plays house with her ex and I get called over when shes horny.

I told her I wanted to talk about it and im going to do my best to talk it out in a rational matter and not blow up on her.

Any advice? Is this just doomed? I feel like I deserve better than this.
<bot>: Im concerned with my girls relationship with her ex and am unsure if shes actually willing or able to give me the attention I want/need. How do I best approach her about this? Also 2 kids...