When a woman wants to fuck you, get closer to you, they'll put actual effort on their end. If you see no effort, she's not worth any of yours.
First sign of actual effort, do they make time to see you or talk to you? Does she surprise you in a positive way with the effort she's putting in? If the answer is no, time to giddy up somewhere else. And just like men, many women simply suck at being a friend or someone you can comfortably rely on.
Time is way more important than anything. Don't chisel your life or who you are away just so you can get an opportunity. The opportunity should be exciting and fun mutually.