I like my best friends boyfriend...

My friend was dating this guy, liking another guy. She and him dated for about a week. She had liked the other guy for around 2 months. We had been texting, and I realized I liked him too. I'm not the type of person who tells people their "crushes." My friend and the guy we both like had been texting for about four months before now, and I started texting him about 2 months ago. So far it's been 6 months since him and her had started texting, and they only first met last Wednesday. Me and him met two days after, on Friday. He loves her and she probably loves him back. They are "a thing" now. 

What do I do?