Struggling with LTR ending in betryal

Hi all,

My LTR of 8 (pretty much 9) years ended 4 months ago. I moved out the home we shared very quickly and was homeless for 3 months. I Initally struggled as the breakup was blindsiding and I didn't quite understand why he was ending things, had a few months where I wa suicidal and I'm currently and anti-depressants. Come to find only a few weeks ago that he has a new girl who is a collegue of his that I was slightly concerned about towards the end of our relationship. She is also 9 years younger than him. He's denying cheating/aving an affair but the evidence is sketchy to say the least and she's pretty much now living in the home we shared.

The main things is since everything happened, I'm really struggling to find distractions. Can't bring myself to watch films/tv, read, listen to audiobooks, go to the gym, cook proper meals, go walking... anything. Other than going to work I'm struggling to keep myself busy when I am alone. I feel like I've had a bit of an ego death and my whole understanding of reality has completely shattered but has left me with anxiety/dread/hoplessness constantly. When I'm around friends and family I cope well, but I can't do that all the time.

Has anyone experienced this after a breakup like this and have any advice on how they got through it? Some days are so debilitating, and I really struggle to see a way out...