You only need to tell a guy once or twice that you are interested in dating him. The guy will either be 'wowed' or will brush you off as just another girl.
If this guy is really interested in you, he would make an effort to spend more time with you instead of texting "I need more space".
Warning: Anything I post may not make any sense. All advice is for entertainment value only. Sarcasm might be present. Interpret at your own risk.