Why does my boyfriend think I would cheat on him/sleep with his roommate?

Anonymous
My longterm boyfriend finally told me tonight why he doesn’t like me being in his house alone with his roommate:

He thinks that I would sleep with him.

This idea is absolutely preposterous. I have never cheated on him, nor do I plan on it.

How can I reassure him that this would absolutely never happen? Even if I were attracted to him (WHICH I AM NOT AT ALL), the fact that it would be so snakey to do goes against all of my morals. I love my boyfriend and am not sure why he is insecure about this.

I will obviously take necessary steps to ensure that he has no reason to believe this would happen by not speaking to his roommate or whatever, but I think this may have been causing issues in our relationship ever since he moved in.

His best-friend’s-ex-girlfriend did this years ago and I guess that may be where this is coming from? I’m not sure. HELP!!!
Why does my boyfriend think I would cheat on him/sleep with his roommate?
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