Why would you still meet him after he asked you about threesomes and then got controlling, possessive, and creepy? You've talked before about just kind of accepting whoever comes along, talking about sex with guys even when it makes you uncomfortable, etc. This guy is showing SO many red flags. He's shown that he is into threesomes (not a real relationship) and he is acting possessive (which could mean he is abusive). If recommend running away! Set some standards for yourself and don't compromise them. You can do better than settling for who is available.