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Just be honest with her. Tell her it's not working out. You're obviously not an ignorant or cruel guy if you are worrying about hurting her feelings etc so just do what you have to do.
As mentioned...

Did you ask her why she thinks it won't last?

I think you should break up. To be honest, when I was your girlfriend's age I had a different boyfriend every other week and was kissing just about everyone I hung out with haha.
Emotions/hormones...

In line with the user above who suggested some sort of therapy - have you considered Cognitive Behavioural Therapy? It can be very effective for some people and especially with problems such as this....

I had another talk with him last night.

We both had our chance to talk and I gave him the chance to walk away, on good terms etc. But, he's adamant he wants to stay with me. I'm happy :)....

I'd appreciate a joke text :).

I don't think there is all that much to analyze at this point. Just wait a few days, text her again and take it from there! Good luck!

Thanks for all the replies.

I've decided I'm gonna have one more big (and sober!) talk with him about all this and if he decides he really does want the single life then I'll have to let him go....

Background: Been together for almost 2 years. I'm almost 23, he's just turned 21. Over the past few weeks my boyfriend has been distant/moody/acting like an asshole etc. Other than this we have had...