[He doesn't shy away, preferring to focus on finding the right words rather than fear her reaction. She can't kill him, and any torture would be tantamount to his feelings at present, anyway.]
Someone tried to take me away from you. But they failed. [Using the truth, less some important details, should hopefully make his story more believable.] I was left barely conscious for quite some time from the magic they used. It pains me to know that I was away from your side for so long.
[he falls to a knee, bowing to her.] It will not happen again, I swear to you.