Q. Available or not? I have been spending a lot of time with a man I think I could have a real future with. The problem is, he has a girlfriend. He never seems to see this girlfriend and frequently asks me out on weekends, but he does mention her. Nothing physical has happened between us—I won’t go there unless he’s free, and he hasn’t tried—but there is definitely chemistry and I sense he knows how I feel. I think I should probably cut back on my own availability; I worry I’m making it all very easy for him and not placing enough value on my own time and emotions. I also wonder whether this mysterious girlfriend knows he’s spending so much time with an available single woman and how she feels about it. Advice on how to navigate this situation?