Well, for my current girlfriend, I've been with her for 10 months and havent got bored yet. Maybe I with her but not her with me.
You dont ALWAYS have to be around her you can hang out with your buddies first than go to her later on.
Were usually hanging out with her friends or with mine or alone and we have flirty things going on/ making out/ converstaions about movies, music, friends, old stories, embarrassing moments. Trust me theres hundreds of things you can talk about.
You dont have a problem having conversations with females do you? If you do, than boy, your gonna have trouble in a LTR if your ever in one.
Just keep it fun and intresting and you'll have no troubles