STI BS

So back in 2020 I had gotten an STI test while pregnant and came back positive for Chlamydia. I didn't know when I had gotten it, my now ex spouse really gaslit me into thinking it was from my SA the previous year, but I took my meds and it was gone by the next checkup (no sex whatsoever until after I was cleared). My ex spouse said he was supposedly negative and I took his word for it (which fueled me blaming myself even more). Fast forward to now, I find out I'm positive for Chlamydia AGAIN. My current partner was negative after his last partner before me and he's waiting on getting back to the states to be able to be tested (deployed). I'm fucking livid because I have a very strong feeling my ex lied about getting tested when he was supposed to. I'm pissed because I took his word for it. I'm pissed because he didn't care about the risks it posed to our child. I'm more mad at myself than anything for trusting him. Is there a chance my 18mo child could still have gotten it passed to him when he was born and just didn't show any symptoms? Should I get him tested for it? I'm just a mess right now and feeling defeated