Hey I just got into a relationship with one of the nicest girls ive ever met. Ive alway been quite stubbon and blunt and my past gf would just take. However she told me something yesterday and I turned her idea down and hurt her feelings and she said I do it all the time while shes never mean to me and said she really like me but cant handle being put down for no reason so she said we will see what hapens. I really like her and I want to be nice to her, problem is that I dont think before I speak. I need some helpguys. Were both really good together until I mess it up by saying something.

Foot in Mouth Disease.

Lookup mindfulness meditation that'll solve your problem. You need to do it daily for at least 5-15 minutes.

Will try that. Any other recommendations

Every tip you get should fall under the catagory or "mindfulness". You need to stop, think, and undertamd the feelings which motivate you to say the things you do.