I did something stupid and now I don’t know how to feel

My fiance and I have been together for 4 years. We have a beautiful 4 month old together, a house we just bought and 2 dogs. He’s been acting a little strange lately so I did something so stupid. I “catfished” him on Instagram and he initially told me he got a message from another girl so I was then going to stop messaging him through the fake account until he messaged the fake account back. At first he did tell me (the fake account) he had a gf and son but continued being flirty so I decided to see how far I can take this. He asked for nudes and kept flirting with the fake account and I honestly don’t know how to feel. I know for a fact he doesn’t suspect its me but I regret doing this. But part of me is happy I did because now I see who he really is. Honestly I’m shaking as so confused on what imma do next. I’ve based my whole life around him and I deeply love him. For gods sake we have a child together. I’m going to confront him when he gets home but I’m hurt and I can’t think straight right now. And Ik I’m going to get women telling me I asked for this since I catfished him but honestly idc he was acting a little shady and now Ik he hasn’t only been flirting and texting with me (fake account) what do I do? I’m a stay at home mom with no income coming in for myself. The house is under his name since he has better credit. I domtknow what to do.