I'm trying to come up with ending ideas for my book. It is a love story, but I don't want it to be too cliche at the end, so help me come up with ideas for a twist I can add at the end of it without needing a second book to resolve something or leaving it hanging. 
I'm happy to help with your book. Here are some ideas for endings you could use:
- Wedding Objection: Just before the end of the book, at the wedding, you could have someone object to the marriage - preferably someone the reader wouldn't expect to object - and then that is sorted before the wedding happens. 
- Till Death: If you really want to throw a curveball and don't mind a sad ending, you could have the main characters die and then meet up either in the afterlife or be reincarnated together. They are still happily together, but most readers probably won't be expecting their death. 
- Nice Suprise: Another option is that you could have some sort of nice surprise for your couple at the end. Maybe one of them inherits something, wins the lottery, or gets a new job in a different country. This will give the reader a hint as to what will happen next in their lives. 
- Family Death: Instead of the main couple dying, you could have one of their family members die at the end. This could be someone they liked or hated, and maybe they even get something good out of the person's death. 