Erectile Dysfunction?

I recently broke up with my GF who i was with for 8 years, but felt it was over for awhile. I like this other and girl and we went out to the bars and had a great time. Feel asleep together and when we woke up we started to fool around. I wasn't drunk anymore but she worked on me for about an hr. She didn't actually touch my just everything. I normally would be erect with my GF at this point, but not with this girl. I really like her alot and haven't had much experience with other girls. she did end up getting me a but it took alot of work on my part and didn't last to long, i can't figure out why this would happen. I was starving but never had this prob before when i was hungry. I can only think of a few reasons why it would happen, either im not ready for it with her (i feel i am) or is because of my break up. If anyone has any ideas i would like to hear them please.