Lonely

I feel like I'm not enough for anyone. My husband about a year ago had an affair for several months. I have felt so unloved and so unwanted since. I also don't have any friends my husband was really my only friend but he has always been very self absorbed. I feel like most ppl are kind to me and I feel like im a a very caring person and kind person but it feels like no one likes me. I'm always the last person to know things and am always left out. I'm really struggling right now and don't really know y to do or how to cope