Feeling unwanted

[Guest Truth]

Male, married for 10 years to my Wife, who I met via a relative for 6months prior to settling down. 3 young children, 2, 4 and 6. Hard working, respectful, strong minded, commited and reliable. Coming into the 10th year of being married, finding that my Wife had taken a keen interest in another male that she meets regularly at the gym. I thought I have my Wife everything, including, comfort, love, stability, emotional and physical support, yet she felt the need to pursue interest in another male, half my age, of an English, white background. I graft hard and look after myself, both physically and mentally, but since my wife's relationship with this younger male developed more stronger for her, it took a toll on my mental health and I started to question what else she wanted. She was in continuous communication with him messaging over the phone and meeting him for personal training sessions at the gym. The chemistry and attraction between them was nothing like I had ever had with her. She physically went to a great length to make her appearance Glow, use more makeup and even groom her facial and head hair more. It got to me quite badly. I called her out on this, as it got too frequent and she didn't stop all these actions. She finally understood where I was coming from, but did not once admit that she was attracted to him. I'm basically calling her a liar and she lied to me about how she felt about him. I asked her what her intentions were and she said it was a New Buzz for her, getting more attention from another person than me, blaming me for not giving her enough. I asked her if she was attracted to him,  it she never admitted it at all. I felt rubbish and wanted to know why she did this. Is this acceptable behaviour? Should I forgive and forget? I called her out, to put a stop to it, otherwise it would have escalated. Feeling lonely and trying to rebuild myself in a more alpha way. Trying to be humble and take a Loss here, but it's hard to accept, as I have a LONG way to go with her and my kids if I decide to stay around. Any advice please?

[Guest Guest truth]

Hello. Does anyone here have any advice to offer please?