The Consequence refers to the resultant action of Tess’s inability to confess to Angel, but also the after-effects of confessing: Angel’s rejection of her.
Tess makes two attempts to confess her past to Angel. The first time his indulgent attitude causes her to retreat and tell him about her d’Urberville ancestry. Her letter slips under the rug, so that this effort to confess also fails.
Tess makes efforts to tell Angel, but is unable to. While it would be easy to blame Tess for this, she is under the difficult pressure of trying to please Angel (who will not allow her to confess) and also keeping her place as a working class woman.