There is some sacrifices to do when you want to be a pilot, particulary in the early years. Living without a girlfriend is one of those sacrifices, like seeing your family one time a year...
Be a little realistic, if you want to built time quickly you will have to move to the most remote places or work oversea. After, in the first year on an airliner, you will have the worst schedules. So, if you have no attachement, you will be ready to seize all opportunities.
Or maybe you found the perfect women, and she will follow you anywhere, anytime, without grumbling. That's what i'm trying to find and it's sounds like win the lottery.