How do you ladies deal with insercuries?

I've been struggling pretty bad for years now. I'll give a little back story. I've been married to my husband 12 years now, we married young we were only 20 but very much in love. I've always known that my husband gets a lot attention from women throughout the years, hes a very handsome, tall, works out, well spoken just an all around a great catch, I even always wondered why he ended up with me, because he by far could have been with somone gorgeous (I'm no troll) but hes definitely the better looking one in this relationship I'm sure most people around us agree to this.

Anyways so almsot 2 years ago he started a different career path and hes now not only well put together but had a successful career to Match but whats different about this new job is that now he works with majority all women (hes always done electrical so him being around alot of woman is new). And I find myself constantly feeling as if hes one day going to cheat or leave me for one of his coworkers? I looked up a few of them on IG and now I find myself obsessing over how I'm sure he thinks some of them are cute. I do have a bit of trust issues because he once lied about working late when in fact he went to a bar with his coworkers, we talked through it and he begged me not leave and that he would never do it again the lying that is. I decided to forgive him. But now I can't help but be obsessed with the idea that he might one day cheat, or even fall for one of them and leave. I know these girls work with him and i know he has to talk to them and there is no getting away from that, but I struggle internally so badly to the point that i cry at the thought of not knowing what is actually going on when hes at work. I read a ton of infidelity stories and I can't help but stress. I started therapy in February to help with this insecurity but I still find myself in alot of pain and stress. One thing I do always do it try and be the best wife I can be, I dont nag him, i please him SEXUALLY all the time, I'm always well put together each day, i eat healthy and i have a career myself so even though I might not be as beautiful as them I know I'm not that bad of a catch myself. What else can I do to help ease my mind? I'm tired of feeling this way its taking a mental toll on me. How do you ladies deal with these feelings? Am I just crazy?

Please no rude comments.