Crazy in Love, Unconditional Love, Plain Stupid or WHAT?

Im 22 yrs old, i have a gf, relationship is starting to go bitter coz my gf doesnt really appreciate me even verbally express it she cant, poor communication, and now im not sure if im in to this lady whom ive known for 4 yrs already,we started as friends and i ended up courting her and like a kid didnt do any courting tactics nothing happened and she had a bf of her own (this is wer i met my gf and then it worked out between us) then my gf and i have been together for 3 yrs, but now that its bitter, this special someone is back in to my life, we attend cles together and eat lunch together, it seems as if my feelings are coming back, or were they just hidden in the back, but now she has a new bf and i have a breaking relationship, im sad, she said im shallow coz i stay with my gf even if im not that happy,and she doesnt like shallow people yet im still here talking to her and getting to know her, im not sure what to do, i dont want to get hurt again (u can email me for more details)