Suppose to be the happiest day

My son was born last night. My "husband" (not sure what I am going to do) let me keep his tablet while he went home with our daughter. Well I found out the trash he cheated on me with he swore he wasn't talking to and has a military order not to, are still talking. If I report him he loses everything. But I am so depressed. Trying to hide it from everyone ... Just want to go home and cry 😳 I feel so stupid how could I trust him