Usually when a guy LOVES someone, he will look that person differently. You can see softness in his eyes something... like that...
When that happens, sometimes it's your friends that will notice it and would tell you that he look at you differently.
You can notice this yourself to.
Exception : Unless the guy behaves like that with every girl. Yup... I knew one.
Otherwise read this :
How to tellAlso, you love and desire someone when you have thoughts of kissing that person...
I am sometimes missing my friends a lot but it doesn't mean I'm in love with them. They bring me happiness and I like to talk with them.