My insecurities are going to ruin me😭

We so young and we got married because we love each other, My insecurities are above and beyond crazy even I can admit that...I can't stop thinking that one day he will just get fed up and leave..his made mistakes in the past but I can't seem to let it go I trusted him at one point but I don't know where that trust went to😞 I'm pregnant and in the first trimester It's not healthy to feel like this I know, I'm just tired of feeling insecure,what can I do?

(This is what he sent me)