In a long term relationship, recently really attracted to another girl! HELP!

Hi, I've been with my girlfriend since we were at school, we're now almost 5 years down the line and we've had no problems. We love each other, trust each other, everything has been great. Around 18 months ago, through some voluntary work I was doing I came across this other girl, and we have since stayed in touch as good friends who enjoy each others company. She's great, fantastic sense of humour, similar to mine, we like the same music and all that stuff, and she's attractive and single. Recently I've found myself highly attracted to her, though I don't know if she sees me in the same way (this may be because I am in a relationship). I love my girlfriend, and wouldn't want to do anything to hurt her. It'd destroy her if we split because we trust each other and see each other all the time, and if I split us up, frankly I would be a proper bastard. However I cannot stop thinking about this other girl. I don't know what to do for the best. It seems like my liking for the other girl won't go away, but at the same time I love my girlfriend, we get on great and because of the length of time we've been together I can't really imagine my life without her. I just feel like, my girlfriend is great, but the other girl is more like me than she is, and we get on great together as friends. It seems like we understand each other more than my girlfriend and I do now. Its unfair of me to stay with my girlfriend if I feel for someone else too, but I dunno if I could bring myself to leave her on the off-chance the other girl likes me in the same way. It seems like I need them both in my life equally! Do I: Let things continue as they are, stay with my girlfriend and stay just friends with the other girl. Tell both my girlfriend and my friend about how I feel and see what happens. Give it a month or two longer and think about it then. Tell my girlfriend that I cannot be with her because I feel for someone else too. Any other options?? I could never cheat on my girlfriend, no matter who I was with I could never cheat, so it's one or the other, or as it is now. All sorts of emotions are running through my mind right now, guilt, confusion, love, betrayal, and I don't know what to do! Has anyone else been in a similar situation to this? What did/would you do? Thank you in advance, I don't know what to do for the best! :S :confused:

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