I would be suspicious as well. As mentioned, there is such as thing as "false memories", people can become absolutely convinced something has happened to them when it has not.

This doesn't have to be the case of course, but for most people, opening up about deep trauma takes longer than two or three sessions.

The thing about the spouse weirds me out a bit as well. It is normal for specialists to not meet the spouse or partner, if this is one on one therapy, then bringing the spouse in would in most cases ring the alarm bells much more for me. But I'd also be a bit careful with therapists who immediately see some trauma as the root to every issue you have with the spouse, especially when not knowing the patient well yet.