I don’t think that Lord Byron wrote the “Bride’s Confession”.   I have studied Lord Byron for a long time as an English Literature major, a I don’t think I have ever seen a poem by that name, among his poems. One website I saw www.eroticabibliophile.com had something about this poem being written by Charles Carrington and” falsely attributed to Lord Byron”.  You might want to check this site to find the answers to your questions.  I checked at the website oxfordjournals to see if anything came up, but nothing did.  It might be a good idea to search the web for more confirmation on the literary works of Charles Carrington to see if you can find the poem, written in its entirety, and then you can compare it to whatever text you are searching for, to see if this is the work you need to identify.