Pornography and my husband

My husband has been going down the garage to smoke, he’s been doing this for over a year since we moved into our house. I know this seems weird but it’s because he smokes weed.

We’ve got a 5 week old baby and I don’t want him doing it around her so I don’t argue about it.

Recently he’s been acting a bit odd, spending hours down there so it’s made me wonder what the hell hes doing.

The other day I noticed he padlocked the garage, which raised suspicions. I know I shouldnt of but I checked his phone and found he had been looking at pornography.

This made me so sick I can’t even look at him. Whilst I’ve been getting our newborn daughter ready for bed he’s been whacking off to other women.

Question is what do I do now? I can’t tell him I’ve been on is phone he will go mad. I don’t want to end our marriage, I just feel hurt that he’s been looking at other women. I already feel shit about myself post baby but I don’t know what I’m supposed to do, I haven’t even spoken to him today so he knows somethings wrong I just don’t know what to tell him.

Am I overreacting?