Moving on with life???

Hi,

I am 48 and broke up with my fiancee 6 months ago... I have been struggling with anxiety and depression ever since... I have shared care of a 16 year old from a prior relationship... My fiance had 2 children and we were planning a child... She brought into my life everything I ever wanted, family, another child, life, fun, but she also didn't follow through on promises and didn't live up to some of the compromises we agreed too... I made my fair share of mistakes too, I have learned a lot since... I feel I blew my last chance at happiness and a family and a life and now I am back single again and feel like I will never find another person and am terrified of ending my life alone... All my gut plans and hopes and dreams have also gone so I feel very lost and directionless and am still struggling with depression while trying to put on a brave face every day... I don't do the things I used to enjoy, I don't enjoy them any more... I just feel like I am existing each day and not living and my life won't get better again... Any help, thoughts, support would be appreciated... I feel completely lost...