Lost erfly feeling of love after depressed mood? (please read all details below)?

Me and my boyfriend have been going out for 17 days now, and for 13 of them I had the amazing erfly feeling of never being able to get him out of my mind, feeling so ridiculously happy because of him, and not being able to get on with general life because of him being in my thoughts so much. On the day of our 2 week anniversary we were going to be hanging out at my house alone with no interruptions from friends or family (which is a rare chance) for like 5 hours, after the end of my last school exam. He was going to meet me out of school and we were going to walk to my house and then spend lovely quality time together kissing, hugging and talking. I was really excited and was really looking forward to it, and had erfly excited feelings as well as the other erfly feelings I was getting. But then the day before this planned day he told me he had to walk his dog the next day and do household chores (we were both on study leave) which would mean us having less time to hang out together. Also, one of our friends wanted to hang out with me for a bit, and it would then mean me and my boyfriend only having less than 3 hours to hang out, which is an awful amount of time! When he told me we may not get to/ have enough time to hang out, I got in a really depressed, sad mood for the rest of the day and it lasted a little into the next day, and it really was ridiculous. I was really really upset but I didn't cry and nothing would bring me out of this dark, sad state, not even the lovely things he was saying to me online or the funniest of comedy moments that I tried to watch. I shut down completely. Now I've had these moods before, sometimes it can be a few months until I have another one, or only a few days. They really are stupid and I know I shouldn't be really upset because we'd still get to meet up, but I just couldn't help it. Now we ended up meeting on our 2 week anniversary for 2 1/2 hours-ish, and spend 1 hour 15 minutes of it kissing nonstop, t'was great! And we've talked on MSN for ages on a few occasions since then, and we've hung out again since then which involved more kissing and he's said really lovely things to me which have made me smile, but I realised on the day after our 2 week anniversary that: my dark, sad mood made the erfly feelings I had towards my boyfriend disappear. They've completely gone. In fact, it almost feels like I have no feelings towards him anymore. Well, that's what I think. I no longer seem to think about him 24/7, well I do, but it's me feeling sad that the erfly feelings have gone and almost trying to force myself to get them back by making myself think about him. And I like saying nice things to him and telling him I love him, but it no longer feels like I mean it fully, and that I'm just saying it because he's saying it to me, because he really really seems infatuated with me and seems like he likes me more and has those butterflies, because he says that after we've been kissing he sometimes skips home because he's so happy! However I love it when we kiss and that certainly feels pionate and I don't like stopping, but does that mean I love him or I just like kissing? I'm really upset that just because I got into a depressed mood because me and boyfriend weren't going to be hanging out for as long as originally intended, the wonderful intoxicating butterfly feelings I had towards my boyfriend have gone and I barely feel anything for him. I want them back! Is there any way I can get those butterfly feelings back? Please help, it's tearing me apart, but I don't want to break up with him, he's my first boyfriend (we're both 17 at the same school and have been good friends for ages before we started going out) plus I've never had anyone (not even family) care for me or love me this much before in my life. Thank you for any help xxx