I'm 34 and my roommate wants to move out of our three-person shared apartment. Should I move out with him?

I live on the left bank of the Rhine in Cologne. I'm 34, male, single, and earn €2.6k net. I work as a software developer. I've been living in a shared apartment for a year and pay €450 including heating for a room of about 8 square meters. The apartment is 70 square meters. My…