Choosing between mom and fiancé

Ap

My fiancé is in the army and wants to get married before he gets moved to Colorado for 4 years. My mom is literally my best friend and spend all day every day with her. She doesn’t have a bf or any close friends so I’m all she really has. I have other siblings but they’re not that close with her and have their own stuff going on. I’ve tried convincing her to get a bf but she doesn’t want one. It breaks my heart to have my mom all alone in a big house and doing weekday activities by herself. I know it’s my life and I should do what I want but I literally want both. Not to mention I’m not too excited about moving to Colorado Springs considering I’m from Los Angeles and there’s so much more to do here and the weather is perfect year round, I’m super sensitive to the “cold”. When I say cold I mean LA cold, I’ve never been in weather bellow 60 or even been in snow.