Insecure

I have been married for 2 years and with my husband for a total of 6. Unfortunately my insecurity is out of control sometimes. I can't help but think that I'm not good enough for him and that one day he's going to find someone better. And unfortunately, social media feeds this insecurity. I can't help but get sick to my stomach when I see he's liked a woman's photo on Instagram, or many of hero girls over a few days. This is completely ridiculous right?! I don't know how to snap out of this fear that he's going to cheat on me and leave.