thinking about this more i think she is doing the slow fade because she is too cowardly to tell you she wants to end it. if someone needs to take a break or think about what they want so early in the relationship they just aren't that into you. i'd just call her back and let her know you are moving on.

with the next girl you meet don't spend every night with her and don't even think about moving in together for at least 6 months or more. develop a well-rounded full life and don't make your gf your everything if that is what you are doing. i think you may be in too much of a rush and that is why these women are initially attracted to you but then lose interest. just have fun and date and let things happen naturally. you don't have to rush things. if you find you are giving a lot and not getting much in return that is your cue to stop giving so much because you aren't being appreciated. you are a good guy, you communicate well and i think if you slow down and make sure you are being treated right you'll do just fine with a little practice. let them chase you a little.