Is he cheating ?

We just found out I’m pregnant and he doesn’t seem genuinely happy idk if it’s because this is my first and his fourth but he’s not even cuddling with me right now he hasn’t even tried to have sex or touch me these past weeks since we’ve found out everytime I ask what’s wrong he says nothing

Edit he told me he wanted to try for a baby he actually stopped pulling out the day I told him I was pregnant he said we are keeping it and seemed happy but only for that day