This question seems to be incomplete. However, there is enough information to find the right answer.
Answer: No
Step-by-step explanation:
In the play by Willy Russell, Denny becomes furious when he finds out that his wife is taking the pill to avoid getting pregnant, despite his constant demand to have a child together.
Rita withholding such information could be considered a betray had both consensually agreed to try getting pregnant, although a woman should always have the right to make this choice by herself, despite her partner´s opinion. But Rita doesn´t want to be a mother yet, she wants to study first, and Denny knows it. His feelings of being betrayed are his fault, as he expects Rita to do something she has every right no to do.