20 Signs Of INTENSE Mutual Chemistry. Learn how to spot the signs of intense mutual chemistry with someone. You might have your eye on someone but how do you know they will like you back? Well there is something called chemistry which is a very complex emotional or psychological interaction between two people. It pulls two people together and even if they try to pull apart they often find their way back. Chemistry is strong and it's a great way to find out if someone likes you because if you can