Psychological facts about human behavior

5. Love and the immune system
Heard the term “lovesick?” But can love really make you unwell? Yes, it can. True love leads to the release of cortisol, which can lower someone’s immune system response when they first fall in love. 
6. Love evolves over time
Initially, when one falls in love, the desire that one has for their partner can cause stress and unmanageable euphoria. However, this settles over time as the anxiety over it lowers considerably. Scientists have referred to this as the evolution from romantic love to lasting love.
7. Better heart health
Maintaining a long-term romantic commitment can be stressful at times, but the verdict is out: married couples in love have better cardiovascular health overall. They have 5 percent lesser chances of any form of heart risk or complication.
8. Love and hate
The deeper you love someone in a relationship, the stronger is your hatred for them if your relationship falls apart. Intense love signifies an invested state of mind where your mind and body are completely caught up in the state of your relationship. Therefore, if things go wrong, hurt and hate are also significantly high.
9. Love is long lasting
Late couple Herbert and Zelmyra Fisher broke the Guinness world record for the longest marriage in history back in February 2011. They had been married for 86 years and 290 days at that time. 
10. Love and similarity with OCD
A decrease in serotonin levels marks Obsessive-Compulsive Disorder (OCD) due to the high levels of anxiety that one experiences. A study has shown that scientists have seen a similar decrease in people who are in love.
Cute facts about love
Love is a marvelous feeling that can make you smile from ear to ear. There are tiny things about it that make it special, endearing, and cherishable. Here are some:

1. Synched heart rates
Love is such a significant factor that it has been observed that the heartbeats of older couples sync together. Their closeness to each other creates an intricate interaction between how their hearts beat together.