I'm a patient guy, but damn, he tolerated her invasion of his space for a while. The blow up at her was unnecessary, but at least he stood his ground eventually.
Cute though this is, I can't help but feel concern that he's not asking her to come with him because he actually wants her there, but because of guilt. Personally, I like my privacy, so I wouldn't invite her, but if he did so because he actually missed her, good for him. If he did so just because he felt guilty... he needs to get over that, because forcing yourself to hang out with someone you don't want to because of guilt is unhealthy.
Still, Cute series and I like the mangaka's current serialization.