Getting over an ex

So my ex broke up with me October 2016 after we were together for 2 years we did everything together I had no other friends (which I know is unhealthy) we were so young as I was with him when I was 14-15 and to be round someone that often was very unhealthy but it’s been over a year now and I’m nearly 18 and I thought I was over it , he got with someone else’s around 3 months after the break up and there still together and I’ve been alone since I feel so lonely and every time I think I’m over him I find my self crying at night for no reason because I miss him or thinking about me and him and I get so angry about his new girlfriend and really upset he’s blocked off everything and sos his girlfriend but I’m so upset still I just feel so lonely all the time and the fact that he’s now happy with someone else and I’m all alone with no one not even getting any male attention ever is horrible someone please give me advice