How should I forget my ex-boyfriend?
One fine morning, maybe tomorrow morning, you wake up and see that there are 7 billion people on this planet. Of these 7 billion, nearly half of them are men, which is 3.5 billion. Of the 3.5 billion, maybe 1 billion are old people. So leave them out.
Now, you have 2.5 billion people more on this planet to choose from, and they are one better than the other. So drop that one who is really a rotten apple. There are plenty of good apples. Look at them all, and pick one!