I've been "separated" for a month and some change now and I'm still not sure whether to call him my boyfriend, my ex, what. It varies from day to day. But separation isn't the end. She needed space to miss you. Give her that space. Don't contact her first. Let her come to you. You aren't going to "nice" her back. Just like you aren't going to push her away but not always being available. Think of it this way: whatever you have been doing, being the nice guy, has gotten you to this point. Do you think doing more of the same is going to get you to the end? I don't think so. I know how hard this is. Believe me, I know. We all do. But she won't come back until she's ready. And the only thing you can do at this point is be the kind of person she would want to come back to. That involves working on yourself, not trying to manage her and your interactions with her. I know it's way easier said than done.
Here's my personal example: I've realized that I give too much to everyone around me. I put *Everyone*'s needs ahead of my own. And the net result has been I'm left with nothing. So part of working on me is figuring out when do I get to be "selfish." When is my own well being more important? I don't have the answer, but getting to the question was a big step for me.
What about you?
M:26 H:32 T:8yrs ILYBNILWY/ "I'm not happy": 2/6/16 D-Day-discovered PA/EA: 2/10/16 Separated: 2/14/16 He's living with OW I moved to different state: 06/16 Currently: Trying to move forward