False friendship and moral concerns

I’ve been thinking a lot about the concept of false friendship. I worry that it is morally questionable, as it doesn’t feel honest. On the other hand, I can’t see any other way of getting close to my ex again, because it seems she can’t bear hanging out with me while I’m still hoping. I am naturally very honest, and I’m not sure if I could act against my honesty by making her believe that I’m OK with the break-up, while in fact I am not. Though if we’d get back together, probably it wouldn’t matter looking back. The point is that we both would be happy. At that time, probably she would forgive, probably even herself would say that I did the right thing, and would thank me for not letting her go – the ends justify the means, after all? I really don’t know.

I intended it as a general question, though indeed my case is the example.