There's this girl in my life that I want more than anything.

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There's this girl in my life that I want more than anything.
We're pretty close. We change in front of each other, we spend the night with each other, we've had sex once and beyond that she's everything I want in a person. She's beautiful, treats my daughter like royalty and acts like more of a mother to her than her own mother does. The other night I fell and hit my head and she got out of bed and drove me to the hospital and sat there with me until 3 in the morning. While we were there she was going on about how she thinks we would make a good couple and such. She is kinda talking to someone and it hurts to see. I'm pretty good friends with the dude and I invited him over to hang out with us because I wanted to do something nice.
It's really hard to cope with but I just want her to be happy. I know she's into this dude and it sucks to see. I haven't told her how I felt about her, and I don't know if I plan to or not Because I don't want to ruin a good thing. What do I do?