Question: how to maintain a healthy relationship with girlfriend?
Answer: Leave no doubts. Simply, make sure that she knows you're 100% into her and not just because of her physical features. ... 
Never go to sleep angry. ... 
Spend quality time together. ... 
Appreciate her. ... 
Listen to her. ... 
Talk about the future. ... 
Give your support. ... 
Avoid using words that might hurt her.