When my girlfriend is busy, all kinds of news are not returned. I always see if she sends me a message, no matter how busy I am. I feel very sad and disappointed. I should be cold to her.

Don't be cold, find a time to communicate with her, try to create a romantic atmosphere for her, then give her a candlelight dinner, watch the stars together at night or talk to her about your contradictions during the break, or ask her if there is anything I haven't done well enough, or what's on her mind recently, communicate more, otherwise it will be more and more.