If a guy was once interested but then a girl came on as being too needy and insecure is there a chance that he will ever be interested again even if she did some things to mess it up?

Dont ignore him, that's game playing. Work on becoming more stronger and independent. Show him the real woman you are.

Answer

Ofcourse!!The only trick here is "TIME". You have to give him some time and show him that you are a happy strong person. You might want to ignore him a little bit and put some distance..