Is it too good to be true?

my boyfriend and i have been dating for 8 months(almost) and he is the sweetest guy i have ever met. the first guy that actaully doesnt want to get in my pants. he is very affectionate and loving, but im beginging to think if it is too good to be true.. he talkes about marrying me and having kids. yesterday he gave me my christmad presents and it was a braclet with my name engraved on it and on the back it was 5808-forever. he also got me a real diamond necklace anddiamond earrings...thats alot for a 14 year old guy to get his almost 14 year old girlfriend. he always talks about how much he loves me..where we should get married and where our honeymoon should be. he is the sweetest guy ever imaginable(: but im afraid soon its gunna end..im afraid that is it too good to be true...i mean when we first started dting we both made a promise that we would never break up with each other...and that promise is still going..but i just dont know if it is too good to be true...should i leave him now? or see if he keeps up with his promise?