I need help..prayers?

My husband and I have been separated since May,..some chic answered his phone one day and I found out he was talking to someone ...so ever since, my little girl and I moved back with my parents..I gave him another chance for us to work it out and in august i got pregnant...sadly, i lost my baby on dec 20 and i thought this was gonna bring us closer..we havent had enough $ to get our own place so i live here and he lives with his parents... but today my sister went out to a club she never goes to..and she saw him there...holding hands with some ..she confronted him and he said she was noone and my sis asked her who are you?? and she gave her her name and they left the club holding hands,,in her car...i feel like my life couldnt get any worse..how could he do this to me after all the pain im already going thru..i feel so betrayed, so laughed at... im herw at home with my daughter, grieving my baby's death and this happens...it makes me wonder if people like this have any feelings..what did i mean to him all this time and how he hurt me with no mercy whatsoever..im sure he didndt think he was gonna get caught and im sure he did it for a long time now... i need prayers ..i need to get up...i feel like im on the floor and lifes just hitting me.... help me ..i feel so depressed...