Go The Extra Mile
When you first got together you probably both put a lot of effort into your appearance when meeting each other and went all out going for regular dinners and dates. The truth is we do grow comfortable and forget to keep this level up.
Make sure your partner still feels appreciated by occasionally surprising them with dinner dates and cinema trips. Make sure you compliment the regularly so they know you are still attracted to them. Make time to go out and spend time together rather than sitting around the house together.