Bad Guy...

So this guy comes to my small town out of no where. My roommate and him start getting serious less then 3 weeks. He works with me and my coworkers tell me not to trust him and not have my roommate bring him over. He lives in a hotel. She’s been spending the night with about every night. So far I know he came Minnesota and he came here to Colorado with nothing . He came to this little town rather then other big names in Colorado. He’s nice and all but everyone at my work is telling me otherwise. Now I don’t feel safe when he comes to our house. I’m 17 my roomate is 19 and he is 24.