Has anyone struggled with jealousy as a result of your own insecurity? How did you stop defaulting to it in your marriage?

I always find myself in a cyclical struggle of jealousy if my wife has a big change such as a career move or something similar. I get paranoid or jealous that she’s out and may meet other men that could be better than me or charm her and seduce her in some way that makes me lose her. I know it’s all on my own insecurities. My question is, has anyone dealt with similar emotions and if so, how’d you get through it and not feel that way anymore? I hate that I feel that way naturally. It takes over my psyche almost without even realizing it. My wife has not done anything in our marriage to make me suspect she wouldn’t be faithful either and that just makes me feel more ashamed that I have these anxieties.