Need serious help Women, and men if you have gone through this! PLS HLP!?

Ok here it goes. I have been engaged about 1yr and 7mnths. We been arguing like cats and dogs. in the beginning it was sooo... good. the first 6 months. then we had our issues. but now, we are not even intamate anymore. We have not had in over 3 months. I want to spark the fire back in us. I want to show her i still love her more than she can imagine. but it looks like everything i do pisses her off. And i dont do it on purpose. I hate fighting. But i want us to work. I know she still loves me, cuz if not she would not be here with me. And i still love her and still willing to die for her. and give her the world. please any advice or anything i will take.