Should I continue or back off?

I want to have sex with a friend of the family, she stays on our house, she always gazes at me and lets me see her boobs, one time I showed up with an erection and hugged her from behind, started grinding and groping her after a while she said no and before leaving I asked her if she likes me and she said yes and took off. After a month we were alone again and she said she doesn't see me that way since she always known me, and that I shouldn't try something like that again, I told her that I do find her attractive but that I won't force her to do something she doesn't want to do, then I kissed her forehead and left. The thing is she still bending over in front of me, she still lets me see her boobs, I have caught her looking a my junk, so what gives? I'm 20 and she's in her late 30s.