So here is some real talk to myself: I need to figure this out emotionally. I need to get to somewhere emotionally where I can be friends. He cannot be more than that with me. This stems into my insecurities. I worry that he won't love me as much as he loves the other. Polyamory is a new world to me. I don't know if I'm wired for it. But my insecurities are what drive my partners, lovers, and even sometimes friends away.

This could be a test time for me to deal with my insecurities. You can practice but only during the actual test can you see if you're really ready.
What do I need to practice? Well establishing some boundaries. I need to tell him no. I need to keep me at number 1. I need to still have time with my other friends, and treat Matty like a friend and not my significant other. While he is important to me and emotionally I am into him, I need to not spend every night at his house. I need to let him be without me and me without him. If he makes decisions that put my insecurities at vulnerable, then I need to learn from that. He doesn't sleep with someone because I am bad, but because new and variety is exciting. for sure. I too enjoy it.

So friends. Treat him and learn to regard him as a friend.