My girlfriend has had one previous long term relationship with another man. This man was very emotionally abusive to her over their 4 year relationship, but somehow made her orgasm often during sex. (i know this because i was friends of both her and him during their relationship)

anyway, i'm now with this woman, and we have sex often, sometimes 3-4 times a day. when we first started having sex she would orgasm everytime, (for maybe the first week or two, then it became sporatic, she would orgasm maybe 2-3 times a week, now after 3 months in the relationship she rarely orgasms, maybe once a week (at best).

She pretty much has given up on having an orgasm now. I hadn't seen her in a week, because i was out of town on business, i come home everything is hot and heavy, we have sex and again she doesn't orgasm.

Is there something im doing wrong?? why did she orgasm so often in the beginning and not anymore? i remember being worse in the beginning of our relationship (performance - wise)

im confused