Let me fill you in on a secret...
When I was young and dating, I looked at all my options on how not to hurt someone that I was 'tired' of or not enough in love with.
First, I would look around, and when I found someone else of interest, I would start a platonic relationship, and gradually distance myself from my current boyfriend - i.e. no more sex or hardly none. Then I would break up with him for one reason or another - there are too many to count when it comes to finding a reason to want out of a relationship, expecially if I don't want to hurt the guy.
Then, I would wait at least two weeks before starting a new one with physical contact to protect myself mainly - no STDs or pregnancy, etc. Once I had that 'clear bill of health' I then got together with the new guy. I was very lucky to not catch anything, and am glad that I did stay true to this 'routine' of protection.
So, if you see your ex going out with others now, she probably had this planned all along, playing it 'safe' in more ways than one, and not really wanting to hurt you.
No matter what motives we have when we break up, it is because we want and need a change because it just is not working right, so please accept this.
I am sure that men have their own motives and routines when it comes to wanting out and needing something or someone new, that's just the way life goes. It leaves a bad taste sometimes, but it's better than not respecting the right of the other person to go through a healing phase and getting on with life.
Some of these men are still my friends, and they too had many other relationships since then - but most of the time our parting was at the very least respectful - we just didn't 'fit' and accepted it.
As I said, that's life and how we handle it is up to us. I never felt the need to cry or mourn, just reflect on how and why it went wrong and tried not to make the same mistakes twice - sometimes it worked, and sometimes it didn't, but we all eventually get on with life and chuck it up to experience.
I guess I never did find Mr Right (a few runner-ups who made me happy though), and will not have the opportunity now because I only have maybe a year left to live, but you - on the other hand, have a long life ahead of you and it should not be spent wasting it on feeling sorry for yourself or trying to figure out her motive and being jealous of her new contacts. Jealousy is a killer for many reasons and helps nobody.
So, now get out there and get a new life of your own. In twenty years - you will still have your memories - just ensure that they are good the majority of the time.
Good luck dear...
http://smileys.smileycentral.com/cat/15/15_11_2.gif
And, honestly - it's not always because of another guy, sometimes it's just that we women are unhappy and need to find out what we really want in a relalationship - and it just might take some of us forever...