Lead On

So this one guy I met online a week ago. We instantly connected, and have talked every single day. We have almost everything in common. I was upfront with him and told him that I was not necessarily looking for anything in particular, but would be open to the idea of a relationship. He said the same. So we kept talkin, and I realized 'maybe this guy is bf material!?'We have met twice, and were going to meet a third time today, but last night he just randomly told me via text he was in an open relationship. He told me he lived with his BF, and he was doing all of this on his radar. Now I personally want an exclusive intimate relationship with another person ... and it wasn't looking like that anymore. I felt betrayed and lied to, especially since his profile says otherwise (single) ..... he told me he is sorry, understands if I block him, and said he wants to make it up to me. Oh and his profile this morning changed from single to open relationship.what do you guys think?! Is he a player and manipulating me, or do you think he is being sincere?