How to feel if your dad has a secret girlfriend, that he didn't tell you about?

Anonymous
So my dad was married to my mom for 16 years and last year she passed away do to cancer. She hasn't even been gone for a year yet, she will be in November and my dad has a girlfriend that he is keeping secret.I hear him talk to her and I read his messages, for a good reason. How should I feel about this? Help!
How to feel if your dad has a secret girlfriend, that he didn't tell you about?
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