Search Results: friends spending the night together

I've been seeing this guy for over 2 months now. We decided to be exclusive 3 weeks ago. A week ago he said he loved me, only this weekend did I say it back.

We spend 3 nights a week together, enjoy each other's company, sex is great and I've met his family members and his friends (they say to him that I'm a keeper).

I last saw him yesterday morning as I left his place for work. He didn't message me at all yesterday after leaving him but I wasn't too bothered about that.

Now it's Tuesday 9pm and I haven't had a single message or call from him. I find it a bit strange because in the whole time I've known him I've never had to message him first. I'm starting to wonder if the ball game has changed, like he's not so keen?

I have asked friends and they've said I should just pick up the phone and call him but my questions are:

a) Should I message him/phone him? I mean, what are the rules/etiquette on messaging/calling behaviour when you've both decided to be each other's bf and gf. I haven't initiated contact unless I've phoned him because I'm waiting downstairs at his door! Am I being completely stupid? Does it matter once you become exclusive?

b) By me continuing to act like this from here on in, will it give him the wrong impression that I'm not as into him as he is into me if he keeps initiating contact 100% of the time? Do you think he's waiting to see if I can be bothered to talk to him?

c) I don't want to feel like I'm burdening him by calling/texting him all the time. He always says I'm silly when I say things like if I'm extending my stay: - "Do you want me to stay Sunday too? I don't want to burden you."
- "Of course I do. Don't be silly."

d) I'm also wondering if he needs his down time after spending three nights with me. I need my space to do my own thing too but that shouldn't stop you from sending a little text, right?

It may be helpful to point out that he's medicated bipolar. I'm thinking maybe he's having an off day?