The main question - How to be assertive with a girl you are exclusively dating?
This question can also be rephrased to "How do you get your girlfriend to do what you want."
The main problems I am having with this is that the girl I am currently dating tend to make me feel bad or guilty in whatever way, whether it is intentional or not so i eventually give in.
So another examples of assertiveness are:
Posting an inappropriate picture of her with one of her male friends kissing her (on the cheek). Many guys may find that fine, but i find that inappropriate when your dating someone.