<human>: Condense the text into a few key points

So, my boyfriend and I have been together for about three months. Best relationship I've had. We get along super well. He often stays over my apartment and after like, two consecutive days of being together I start getting cranky and bitchy. As I write this, we've been together for three whole days doing nothing in my apartment. He kisses me and tries to initiate sex but I don't even feel like kissing him. It makes me feel horrible!! Usually when we're not together we really miss each other and when we see each other we have a very, very, active sex life. But after a few days of constantly seeing him 24/7 I just feel cold towards him and the worst is I know he feels bad but I really can't help it.
<bot>: Can't stand my boyfriend for long periods of time, is something wrong with me or is this normal? Am I being mean? How do I tell him I need space without offending him?