Your W already told you flowers made her uncomfortable. Flowers are for ONE day. Now you want to pressure her to make a decision about a gym membership that will last much longer than one day.
I know it is hurtful when we find out the WAS has done something as an individual but at the end of the day a gym membership isn't going to make or break the marriage. She chose to renew it on her own, she chose to pay the higher price and that is that. Why keep bugging her about it? It again makes you look like you are trying to save her or inject yourself back in her life in some way.
Renew on your own and don't talk about it again with her.
