Could it be my size? my gf never have have an orgasm w/me, pls assist!?

my gf and i have be 2gether for 2yrs. but she's never had an orgasm w/me. she's have them w/ her ex bf( including multiple orgasms). ive gone for over an hour on occasions and she doesn't similar to oral. i know her ex-bf was larger than me. could that be the object?? Here's a secret most guys don't know. A woman's body is one huge erogenous zone. She is more sensitive to touching of other areas of her body than merely the "private" region. Everything matters. Stroke her mane, kiss her neck, softly brush her body. It's the anticipation that excites her, purely as much, if not more than the actual intercourse. In a word, foreplay.and lots of it! Tease her until she can stand no more. Make her borrow if that's what she likes. But do ask what she like.
It's not the size that matters, it's the attention. Let her know she's worth it to you.
perchance you're just not hitting the right spot. Ask her what she requirements and what she likes while you're have sex.