Husband Created a Tinder When Our Daughter was 6 Months

I don't know where else to go and could really use some advice. Last night I was washing the dishes and my husband comes into the kitchen watching videos. I ask him if I can watch with him since. He seems hesitant but comes next to me and shows me the phone. All of sudden, I see a notification from Tinder. I ask him, "you have a Tinder?". Mind you, we've been together for 6 years and I've used his phone and I've never seen the app until now. He then tries to come up with something because he's stuttering and mutters, "it's old" and deleted the app immediately. I am appalled and taken back because obviously that's not the truth. He's trying to grab me to explain and I pull away, asking him to please not touch me. He proceeds to tell me that he was on tinder because he was seeking attention from other females to boost his confidence. While mine is on the floor because I'm still battling depression/suicidal thoughts, trying to cope with my mom body, and do my best as a wife and mother. He posted that he was a bachelor (no wife, no kids), and photos of him in civilian clothes and military uniform. I always compliment him and tell him how much I appreciate him. He's in the national guard and was activated a few weeks ago leaving me alone with our 9 month old daughter. I messaged him everyday saying how much I needed him and wouldn't know what to do without him. There's not a day that goes by that I don't tell him how handsome he is, but apparently it wasn't enough. I don't know what to do because he deleted his account and I couldn't see what happened (which leads me to believe that a lot happened). I'm a SAHM and don't have much money in my account to go anywhere. Last night I couldn't sleep in our bed and I slept on couch (he got the guest bedroom). He downloaded the app in June and I honestly think he still would've had if I didn't see it. Whatever confidence I was building has been broken down, I don't trust him, and I don't know how to keep going forward. I love him so much and he is a great dad but I'm at a lost.