how to be not boring to your girlfriend?

Simply initiate a conversation and turn a listener. You will never bore a girl. Let her do all the talking. You just speak enough to keep the conversation going.

I think in a relationship there is a time when you really get bored. Maybe when you know each other too much or life for both of you gets routinary. What I can advice you is do something different. Like writing a letter, walking in a park, or go out of town the two of you, or do something that is different like cooking for her.

honestly.. be yourself. she likes you for being you, not someone you're not. and you'd most probably get tired of trying to be someone you're not...