2. We Get Jealous When Our Best Friends Have Other Friends
It's just a fact of life. Whenever you're best friends with someone, you can't fathom the thought of your besto getting close with someone else. You're not possessive but they're YOUR best friend, so who is this intruder and what is she doing typing BFF next to her name and their name on her social media account? Does she not know who you are? Although you're bound to get jealous, try not to get too obsessed, she'll realise her mistake eventually when she finds out this intruder is nowhere near as funny as you.