Moving out mixed emotions 😅

I’m 19 and my boyfriend is 21. We’ve been together almost 2 years and already kinda live together. We switch between houses. Might sound weird but there are reasons that I’m not going into lol. Anyways his parents just bought another house. They own 12 or 13 already and fix them up! They do amazing work btw!!!!! But they just bought another one and my boyfriend and I will be helping them work on it so it will one day be ours. It won’t be ours for awhile bc we will all be working on it for 2 years maybe longer. But I’m nervous to leave my mom... and I don’t mean I want to live at home for ever or that I’m afraid to be on my own bc I’m more then ready! But I don’t want her to be alone. My parents are divorced and my mom has given up on dating. I’m the only thing she really has and I just don’t want her to be lonely😭 I know I eventually have to move out but I’m just nervous I guess. I guess I have 2 years to prepare my self... anyone else have or had this issue??