relationship advice

I don't know what to do I've been chatting with this guy for a little bit and I kinda sorta met him through a friend we he asked for my info from her. But she told him not to talk to me and got jealous or whatever. And the she actually removed me from his snapchat. And he constantly complains saying she's annoying and all that but he's always with her somehow. And I know her she's not above trying to get with or sleeping with someone I'm interested in. It's like anytime I get a guy over her she throws herself at him. He told me not to worry that he only sees her as a friend but she has more opportunities than me to see him and I know how she is and I just need some advice