"Feel what you need to feel, but don't let it take over your life. Because they will get married, but everyone's life will go on, and it might as well be positive".
SO TRUE!!! We can choose to be happy and move forward or we can choose to wallow in self pity. That was not aimed at you - it was something that took me a very long time to learn. Some people get so stuck they never get past this. Don't be that person. We only get one shot at it so make lemons from your lemonade. I had to get past this plus my firstborn getting brain damage and then my trusted employees all turning me out of my own business. But I got through it all and still smile every day.
I saw a guy on "Hoarders" yesterday and he had allowed the hoarding thing to take over his life. He said it was because his wife and daughter left him 20 years ago. He was not an OLD man. But he wasted his life wallowing in self pity. Nope - no one should end up this way. There are no guarantees in life. We just do the best we can and put one foot in front of the other every day.
This too shall pass and you will look back one day and know it was all for the best. We don't always understand why at the time but it does work out.