Why is he ignoring me?

So I've been in love with my best friend for more than a year now. He's known I like him for like 6 months now. I haven't told him I love him like that though. He said a while ago he had unexplainable feelings for me. Then I noticed him and my ex best friend getting really close. She started spending the night and I noticed they were into eachother. I'm not even friends with this girl anymore because she betrayed me and went behind my back and lied saying she would never get with him or even try to. I then talked to him about it saying I felt out friendship was fading and that I want him back in my life like it used to be. He told me not to worry because him and My ex bestfriend don't have anything going on. Last weekend a friend showed me a text of my friend stating he's trying to get with her. So he lied to me. And it's like why should I care since were not dating? But I care so much and some of it is jealousy but it's also that this girl lies about her whole life and I've warned him. I cant keep trying to warn him because he will only take it as jealousy. She hangs out alone at his house all the time. And it hurts so much because I'm so inlove with him. Anyways, I texted him and confronted him that I knew the truth. I said I wasn't mad but I was hurt. He never replied to that and I've snap chatted him one time no reply. It's been 3 days. Also. We hung out 3 times last week and after that said " I miss you lowkey" and asked if I would spend the night sometime...