Advice on sex life

So I have been dating my boyfriend for almost 3 years now. I love him to death and we have a great relationship....but our sex life has gotten a little boring. I've tried talking to him many times about wht we can do and wht he can do to make it better and it will work for a little while but then it will go right back. He was the first man i ever slept with but our sex life has just gotten routine and boring. Like I've never orgasimed by him and idk if that's bad or wht so please help me on wht I should do!!!