Valentine was a holy priest from Rome. We celebrate his honor on February 14th every year in which day he have past. We celebrate his day because in his time there was a Roman king that wanted men to join the army and but all the men wanted was to marry and have families, so the king made it illegal to marry. Valentine believed the men should not be forced to not marry the ones they love so he would marry couples in secret until the king have found out and put Valentine in prison. He wrote his family and friends and ask for their prayers and not to forget their Valentines. The king have murdered Valentine on the day February 14th.

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By the graph i can say that around the times people have the most fun and excitement is around spring break and 2 weeks before Christmas.For people who have a hard time struggling family and relationships around this time people should take time to relax and think about there actions that will effect there loved ones.
Spring break is a time for freedom and fun and many people do not want to be in a relationship around that time, to survive a spring break relationship you have to set time for your partner and cause less tension on the relationship.  
People on Monday's are mostly moody and stubborn so that explains why many people would break up. To avoid a Monday break up try not to be so moody try going to sleep earlier and have a good attitude so you can not start off your day terrible. 
April fools day is full of jokes and being rude, to prevent a April fools break up and you wanna play jokes on your partner try not to make the prank so harsh and mean.
Many people also break up around Valentines Day so they would not have to spend a whole lot of money on presents so many people do not like to be in a relationship around that time of the year. If you wanna stay in a relationship around Valentines day you do not have to spend thousands of dollars try to do  something from the heart you do not have to spend money to make some one happy. Your presence should be good enough.
Summer holidays are very calm and relaxing usually people do not break up around that time and if they do its usually the start of summer. In the summer relationships should be the time you and your partner should spend the most time with each other hang out everyday