Is it worth getting your ex back?

Looking from a male prospective getting your ex back might be costly. Spending money on gifts can be time, money and energy wasted. Men want to know can you offer any guarantees with getting your ex back. The best thing to do is to be up front and just say, look i want to get my ex back. Be honest, can you see yourself with this person in your life again, can we make it worth it this time. You don’t want to waste more energy into a relationship that can’t and will not go anywhere. They say anybody can change but can you change who you are? If it didn’t work the first time will it work the second time around?