Help don't know what to do

How would you react if you see emails of women on a dating website your husband is on ? Just saw some emails of dating website on my husband phone . It hurts because being pregnant of 7 months and him not touching me and then seeing this is just f** up .

How would you react?

UPDATE.

He tells me he doesn't know how he is on the dating site

That he wouldn't do that to me and our Family. That we been thru a lot and he wouldn't. I don't know if I should believe him