I found out my boyfriend is/was a serial monogamist, is this a bad sign?

Anonymous
I've been dating my boyfriend for nearly 4 months but I'm finding out certain things I'm uncomfortable with. He recently asked me to move in with him but I've declined. For some reason, I still haven't had sex with him yet. I'm having second thoughts and feel something isn't right.

I just found out he's been with 10 different gfs (back-to-back) in total and lived together with all of them. All those relationships ended in break-ups. I'm not liking it at all. It makes me think he's not serious and he just wants to be in a relationship for the excitement and the sake of temporarily sharing a house without any commitment ever.

I'm thinking of reconsidering this relationship. Is man that gets into relationships back-to-back a bad sign?
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1 y
He keeps saying that it's different with him, that I'm special, etc. I don't know. Something doesn't feel right.
I found out my boyfriend is/was a serial monogamist, is this a bad sign?
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