what he ment was to create another variable. As you only switch between 2 states you can use a boolean variable. This could be either false or true. So in your case "love me" or "love me not". If you have more than two strings use an int.

so what we need to do is declare the variable

boolean love = true;

then in draw write something like this

if(love){
text("loves me",x,300);}
else{
text("loves me not",x,300);
}

//there are different ways to do that. change the String itself. or use different strings or whaterver. this is just one solution.


and in mousePressed you have to change either your variable is true or false.
The easiest way to do is to say

love = !love;

this reads "make love the opposite of what love is right now" so if its true it turns false and vice versa.

Hope that helps you.