I'm going to use my boyfriends credit card without him knowing.
Why would you use your boyfriends credit card?
I just want to see what they can offer me.
You shouldn't use someone's financial information without their permission. Even if you are in a relationship, using their money behind their back can be considered a betrayal. They may become angry and end your relationship over this.
I like living with such a toxic environment.
If you like toxic environments then you have issues you need to resolve. Being in a relationship to be toxic hurts others.