I'm moving in with my man. His best friend went through a breakup and wants to move in too. Am I selfish for not wanting a third person in the mix?

The friend says it'll be temporary but I know it won't bc it's not out of necessity but due to him not wanting to be alone. I don't feel it's a wise decision to allow a third party into our living space. This is a big step in our relationship and we are ready to start building a life together. I am a private person and don't want to include someone else in everything I do. I don't want to look after another man when it comes to food, cleaning etc. I don't want to be in a situation where my man feels pressure to split his time between us and feel obliged to include the friend. I don't feel comfortable/safe living with another man other than my boyfriend. His friends is basically an alcoholic, does drugs sometimes & pulls al nighters often. He is a great person, with a good heart but has a strong personality and completely over powers my boyfriend. His friend has a house and enough money, it's purely bc he doesn't want to be alone and wants my boyfriend to be his flatmate again. But my boyfriend isn't in the same space as when he was younger, he doesn't want all nighters drinking etc. Shouldn't his friend be happy for my boyfriend because we're taking such a big step, and want to give us our space to enjoy it? They also work together & there are no work boundaries which stresses my boyfriend out. I know this will be worse if they live together. Basically I know my boyfriend will be frustrated often. I'm not in a space where I want frustration in life. I value my peace and space. This friend has done A LOT for my boyfriend in the past, like letting him live with him, and so he feels bad to say no because of that. I feel we can find an alternative, the friend can move closer to another apartment if he doesn't want to live far away and we can support him in other ways through his breakup other than living with him. My question is, am I wrong/selfish for thinking this way and not wanting a third party in the picture? Would you agree it is a bad idea relationship wise?

I'm moving in with my man. His best friend went through a breakup and wants to move in too. Am I selfish for not wanting a third person in the mix?
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