In love or not?

I've been going out with my girlfriend for about 7 months now and she's great, so perfect for me. We have similar personalities, get on so well, have loads in common but I don't know if I'm in love with her or not. 3 months ago, I thought about telling her I loved her, but I didn't. Then 2 months ago she went back to her home country for the summer and told me she loved me before she went. I was a bit shocked at the time, so didn't say anything. Then after an emotional phone call, I said it back to her. A week or so later, I was doubting my feelings and so told her and I didn't think I was in love with her afterall which sucked, but she understood that I really care about her. Every now and then, I get butterflies when I think about her, but a lot of the time I think about her, I'm worrying about if she's gonna leave me cos I can't say I love her, if I'm bisexual or gay (cos I'm attracted to some men too, but I still find women attractive, especially sexually) and that I might end up hurting her if I turn out to be gay, if I'm still attracted to her or not, if we will work out cos she's living abroad for 4 more months then coming back. But I really do care for her; she's so caring and understanding, funny and easy to get on with and fun to be around. Or maybe it could be I'm worried that part of her is a free spirit (hence living abroad for her studies for 4 months) and maybe I'm sub-consciously not allowing myself to fall in love for fear of getting hurt or hurting her? Or maybe I'm over thinking fall in love and putting too much pressure on myself to fall in love? I don't know! Help please! Thanks.

We've even talked about moving in together next year, we've dreamed about more holidays together, jokingly talked about kids...maybe it could also be I'm subconsciously worried we're moving too fast?