Really hard to give advice when there’s a lot of factors involved, like:

• how long have you been together with your kid and your second wife?
• did she know what she was signing up to?
• how much time are you dedicating to her vs to the kid?

And then, jealousy is a subjective feeling. Now because you know how she feels, if you are spending basically no time with her then you might be able to carve out some more time for the both of you, but the main part of dealing with the feels is on her. Growing a better connection to you or the kid is also on her. And communication is key. Relationships are hard and complicated, that’s why you gotta talk a lot.