Realized I don't trust him...

A year ago today my 25 yr old husband cheated on me with a 44 yr old women. They had been sexting for weeks and I found all the texts and still have them. She knew about me 100%. Last night I was thinking about it (not that I wanted to) and I realized I've been lying to myself all this time...I do not trust him. Now it's killing me I don't know what to do...I'm now 22 weeks Pregnant with our first baby. Should I talk to him about it? Or should I try to learn to trust him on my own without bringing it up to him? Need advice... I'm pretty upset.