Communication problem. Whomp.

In my two past relationships I was able to communicate my issues no problem, but now I suck ass. My first relationship he never took me serious, never responded or just walked away so eventually I stopped communicating. My second , he would listen and communicate back, pretty much showed me the ropes but ended up cheating the entire time we were together (even told his ex I was crazy we were never together I photoshopped our photos) so I lost all trust.

Now , I’m in a great relationship, for the most part every relationship had its issues , but now my fears are causing major issues. I don’t know how to communicate insecurities I have due to either feeling like I’m taken as a joke or I’m being lied to. So I rather just not do it at all. But now he’s doing things that trigger even more insecurities. I’m afraid if I try to communicate it won’t come out correctly or he’ll say I’m trying to argue. So I’m just over it and need help lol it’s like insecurity on top of insecurity. And this is not like me at all so I feel even more insecure because I know I’m better than this