This is weird.

Yesterday I went to my friends house after work, she's married and has an 8 month old baby girl. Her husband was there when I got there, but after a couple of minutes he came out of their room and was about to leave. My friend got up and gave him a condom, when he left I was curious about the whole situation and asked her what had happened and she said 'you have to do whatever you need to to keep them around right?' and laughed. This is so weird to me, I don't know if he's sleeping with someone else or what he's doing but I'm really confused about the whole thing. I don't know what to do, they've been together for about 6 years and they've had lots of problems but always end up together because she's so attached to him and she starts telling him she'll kill herself and whatnot. Should I get her help? I'm honestly very confused and worried