Most Helpful Guy
I would be patient with her; to figure out why she feels needy! If it's an insecurity issue, I would try to comfort her in letting her know that everything is going to be ok and that'll take time to increase her level of confidence and self-esteem! If it's an abandonment issue, I would focus more attention on her while at the same time, ensure her that if I had to leave, I'll keep in contact with her when I have open time. She'll need to gain independence on her own so she doesn't call or text every 10 minutes of the day. If it involves with having too high of expectations, I would inform her that there are certain boundaries to respect and that not everything can go as smoothly and/or perfectly as she imagines it.
A good guy will be patient in helping out with her flaws so she can become a better person! It can be common for a woman to be needy at times but that's a call for assistance, not to run away. These are the things I would do if I was with a girl that had a needy attitude!