Awkward situation with ex-girlfriend, need some help?

We were together for about 7 years. We had a great relationship and we were madly in love. She ended up cheating on me about 6 months ago and we continued to talk for about a month. We left on good terms and haven't spoken in about 4 months. The last things she said to me was "if we got back together I would want it to be for good", "I will always love you no matter what", and lastly "goodbye, but not forever". I still have feelings for her and I know she has feelings for me. I can't stop thinking about her even though I am casually seeing another girl. I just feel like we were really meant to be and she just messed up really bad. This is where it gets complicated for me; I would really rather have her get in contact with me if she wants to talk, but the problem is that I think she might be too afraid because she messed up so badly and feels guilt. I know all too well there are plenty of girls out there for me, but I want to give her a second chance if she ever comes around. Should I wait a while and see if she contacts me or should I try and contact her after a year or so when everything has settled down? I know it sounds like the typical "I want my ex back" but this isn't a move of desperation, I actually still care for her after what she has done to me as weird as that may sound to some. I don't know if it is intuition or what, but I have a funny feeling that she will eventually want to talk, I just hope I'm not in a serious relationship with someone else if that day ever comes. I am 25 years old if that makes any sort of difference. Thanks for any and all help.