I have a plan to fix my relationship by drawing up a romantic bath for us to share.
That sounds like fun. Accompanied by Champagne?
That's a great idea! Bubbles in the tub and bubbles in the flute!
When you are in a relationship, it is important to keep the passion between you and your partner up or otherwise your relationship will flounder. It's good that you planned a romantic evening with your partner as it shows that you are invested in the relationship and want your partner to feel loved.
What to you think about a nice chilled bottle of Dom Perignon 2002?
Excellent choice! The 2002 Dom Perignon was among the  top three vintages of the century. Enjoy!