Do platonic friends say "I Love You" to each other and speak everyday?

is this normal behavior? how often should platonic friends speak with each other (especially if the guy has a girlfriend)? What are some suspicious behaviors?/ Do platonic friendships work out? or does one person get attached to the other? When my boyfriend says "I love u" to girls that are just friends and nothing more, does he mean he's attracted to her or is it just in a friendly way to make her fee good?