My ex left me in February 19 this year, but after I found out ONLINE he had hooked up with an 18 year old.The girl had it on her profile. He contacted me yesterday after over a month of now hearing from him acting like nothing happened.

The new guy I have been talking to every day in text and on phone I have known going on almost a month. So from February to the very end of April it has taken me to straighten out most of my life out.

The next time you ex contacts you, ask him to leave you alone.  My dear one, at your age, you and your ex and his and theirs...... will go through boyfriends and girlfriends..... This is how we mature emotionally. Even in later life, when it comes to partners, we still find ourselves vulnerable when someone leaves us or when we meet someone new.  All I can say is keep your friend on the ground; love, smile, cry.... all these are part  of our journey in life.  
All the best to you.

Remember that when an ex contacts us (and it happens to all of us) that nothing has changed.  He is the same person with all his faults as when he left.  So why go back to that well when you have become someone different after the experience?  Always looking back over your shoulder means you will not see what is right in front of you.

Correction..... correction to my previous entry.  Was supposed to be ''feet'' on the ground and not ''friend''. Sorry.

The next time you ex contacts you, ask him to leave you alone.  My dear one, at your age, you and your ex and his and theirs...... will go through boyfriends and girlfriends..... This is how we mature emotionally. Even in later life, when it comes to partners, we still find ourselves vulnerable when someone leaves us or when we meet someone new.  All I can say is keep your FEET on the ground; love, smile, cry.... all these are part  of our journey in life.  
All the best to you.