Realize that you should be very important to this person and that you and your feelings should matter at all times to your significant other. If this is not the way it is, you take all the strength you can muster, pack your bags and go. You say they have taken you back like they did you a favor. Any relationship takes two people giving 100% to each other at all times. Consideration, compassion and caring at all times. Yes, they will be rough times and disagreements but those should be far and few in between and should be compromised upon. Without all of these elements present you dont have a committed relationship you have a convience.