<human>: My boyfriend and I have been together for 16 months. I moved to his state for him, we originally met online. Before he met me, he had a huge crush on this one girl for 3 years. Then he met me. He clearly loves me and wants to be with me. But this girl confessed publicly that she had feelings for my boyfriend.. my boyfriend and I cut all contact from her for almost a year. We recently became friends. (I don't know how but it happened) she's become a good friend and she is in a relationship with a guy she has been on an off with. They have problems but she hasn't done or said anything about MY man. I need to move out in December and need a roommate. She has volunteered to move in with me with her boyfriend as well. I think it would be great because rent is split 3 ways. But.. my boyfriend will be moving in a few months after. I'm worried something could happen. Am I over thinking the situation? Should I go for it or say no?

Can you summarize the given text in a few sentences?
<bot>: should I move in with my boyfriends ex crush of 3 years? Am I over reacting or should I go for it?