Ladies, what are your real intentions here?

I’m stuck in a situation where I don't know what to do. Me & this had in a fling beginning of year which grew into something more. But along the way, she felt like I was way outta her league, so she ended up hooking with her coworker who’s 9 years younger. They live together but not in a relationship and is having his baby next month. But ever since she hooked up with him, she’s been regretting it ever since because she’s already a mom of one with no help and now another coming. And wishes it was my kid she was having. He hasn’t helped her out at all with nothing. But the past 2 months we’ve reconnected and been talking and hanging out as whatever we are. But she wants to everything with us a secret from everyone, especially him. So my question is what is her endgame? Should I fight for her knowing we both have strong feelings for each other or should I leave and move on? Ask me whatever if you need more information

Ladies, what are your real intentions here?
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