I want to be happy and I can’t: what do I do?

good morning
I am a man who a few months ago had to leave my home without being able to do anything even though I spent a long time trying to hold on to my relationship with my wife, in this case I couldn’t because she admitted to me that she had another relationship, my world has turned upside down. sad, empty and alone, many times I get up and other times I fall and it is not what I expected to live like this, I had a home, a wife, children, a life I liked to live it with worries and everything but my goal was to make them happy, for about 5 months I have been taking care of my children since their mother prefers that new life that she has been leading so far, I am a guy who prefers to listen and forgive but today after so much time I feel alone, right now we are going through legal situations to be able to have custody of my children it is difficult This is because I don’t want to harm anyone after the damage I have felt, I still dream of my home, my wife and seeing my children get up every day and seeing them laugh, I feel like I no longer have the strength and my life has no meaning, I don’t know what to do next. or leave everything many times I had to accept the ideas of others and I lowered my head and I don’t want to live like that.
I would like to be happy, exactly 12 years ago I had my little daughter, her name is Alanisb, today it’s her birthday and I can’t see her yet, I told her I would pick her up but I don’t know what else I can do. I also have another little one called Lucca, he is so affectionate and attached to me, many Sometimes he saw me cry and he hugged me and told me dad, don’t cry for mom anymore, I love you dad and that saddens me more because it’s not something I want to show them but I still can’t get over this sadness in my heart.

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A few months ago I went to a psychologist but now my children no longer want to go very often, I have a lot of doubts and fears but many times I am facing them.
Please, I’m just asking you for something that can help me in some way of living that is not so complicated to understand and do.

Thank you