Fully Depressed now I can't face this

My marrige broken 1 year back she cheeted on me and  before marrige I asked clearly but still she did wrong, and then i have strong believe that  everything is finished but again one girl came to My life but now I am not believing on  her checking only truecaller and I know she is also cheeter that why not believing reason she is also dont care about me i need to always fight with her to talk to me but no response now I am got it all are cheeters how these peoples are playing with someone hart they don't have fear of god everyday i am crying..even had small enjury on my tounge gone through multiple doctors  because no believe to anyone and  forcefully went to PET ct scan and report comes normal now all doctors and family members are saying you need psychiatry help you are mental case, I am cyber security professional how come they are saying I am mental case 😔very very much depressed now not able to understand why it's happening with me what I did wrong what's my fault...