I think that many people underestimate the emotional rollercoaster that is losing a partner. Finding someone special to you is extremely hard, so when you finally meet that person, you feel like you have won the lottery. Losing that person feels like you have lost the ticket on the way to collecting your winnings. Unless you have been in the situation of splitting up with someone you love, there is simply no way to explain the pain.
A lot of people develop anxiety problems linked to splitting up with an ex. What are they doing? Who are they speaking to? Are they considering starting a new relationship? Did they ever care about me? Will I ever get back with my ex? These are all questions that are likely to be spinning round your head on a constant basis. In fact, you probably think about your ex before you sleep, when you wake up and throughout the day!
All of these thoughts are only natural and at least they show that you did genuinely care about your ex. The good news is there is still time to do something about your break up. Around 90% of relationships can be sorted out, as long as some one takes the initiative to do so. This means seeking professional advice. Don't listen to free resources on the internet, as they are likely to miss out all the important information you need. Instead find a proven system, which has worked for others, and hopefully will work for you!