I feel I will end up alone for the rest of my life?

I feel that I am coming close to my 40's and will end up alone as my love life is a total mess. I was in a long term relationship for 7 years, which didn't work out as he was abusing alcoholic and cheated on me. So I ended up divorcing him and it was 8 years ago. Since then I worked a lot on my self esteem and everything, met a guy who liked me but I did not feel it was leading anywhere. He was 10 years older than me with no vision of his future. I mean his mom was still cooking for him and he spent most of his time in gym and hardly worked. It will sound awful but all he was interested in having sex 5 times a day every day and I just didn't have anything to talk to him about. We were together for 2 years. I had to end it. Since then I was not dating for about 2 years as I just wanted to set for myself what I actually want and did not want to get involved in relationships which were not going anywhere. Now in past 2 years I met 3 guys I wanted something with. The first one was younger than me - 30, he vanished after 3 months and turned out he had a long term girlfriend. Other one was 43, I dated for 6 months and he just dissapeared on me... he came back after a month but I was nothing more than a booty call. Now the last one is 40 we kinda knew each other for a while but we started dating recently and all of a sudden he goes silent on me and the next thing I see on Facebook he got really serious with 20 year old. And all the stories about not seeing himself married or having kids just vanished as now all I can see on my Facebooke wall how he braggs about all the places he visits with this young girl, talks about kids etc... I am just sitting here and feel like a failure... seriously... I just do not have energy anymore...
I feel I will end up alone for the rest of my life?
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