How should i (F25) leave a bad/dying relationship with (M26)?

I get this may seem like a silly question but this is actually my first boyfriend and I don’t have any experience here. We live together and have a house together etc. How do I go about separating our lives? I work with him? His dad and his uncle. His friends (and their gf’s) are like my only friends at this point. Like how do I actually go about leaving? What steps do I take to leave safely and effectively (without backing out – which I have done before) I don’t want to be stuck with him forever bc I’m too scared/worried about leaving. I don’t want to ruin his life or anything but like what are the logistics of leaving? Should I try to get all my stuff out before he comes home? Should I talk to him when he gets back from his trip? I need help. Please – thank you

TLDR; boyfriend cheated and I need to leave but like what are actually the steps. I feel like our lives are so intertwined idek where to begin