I hope you can work it out with you current girlfriend but that may not be what's best for anyone involved. The fact that you went to your ex's place means to me that there is part of you that wants to get back together.
You may not agree but look at what you wrote here. You didn't once mention anything about helping your ex with her problems that were so overwhelming. Instead your whole story was about resolving all the old problems of your former relationship....
You only felt bad when you realized you had to go back home and explain. You need to really think about what you want and who you want that with