<human>: Could you distill the essence of the text into 1-3 sentences?

So a couple of months ago we decided to go exclusive and officially be girlfriend and boyfriend. At this point we became exclusive out of care for each other and not wanting to hurt each other, not because we didn't want to get with other people.

Recently she has had a change of heart in that she has no desire at all to get with anyone else, whereas for me it hasn't changed, though I would never cheat anyway so I didn't think it was an issue. It came up recently that I still do, and she thinks we can't be together if I am still thinking about other girls.

Am I wrong in thinking that being exclusive because you are willing to sacrifice any desires you have to get with anyone else just to be with this one person is just as valid as being exclusive because you don't have these desires? Or were we wrong to make it official at that point in the relationship? Not really sure what to do, don't want to end it here but maybe I'm in denial and it should end.
<bot>: Potentially breaking up over a difference of opinion, not sure whether to try to change her mind or just accept it and move on with life without her.