After my best friend passed away and my marriage ended in 2011, I felt the way you do right now. I was overwhelmingly lonely and lost. It lead me to engage in substance abuse, and I was taken advantage of quite a lot from September of 2011 well until 2012 by people I wanted to care about me.
Right now I'm in a shut down of sorts. I have no interest in interacting with my partner or very few others for that matter. I feel numb and cold and don't have the energy for people most of the time including my own children (though I always fake it for the kids). Now that I'm sober and I realize just how bad I was being burned by people who called themselves my friends, I don't wanna be hurt anymore or base my identity off others any longer. I'd rather not have an identity if that makes sense.
Don't jump into anything, and don't let the feelings you're experiencing lead you down an unhealthy path cuz you don't wanna learn some lessons the hard way like I did.
If you have a therapist, maybe you can consider talking this over with him/her and making a plan to help you get through this.