My wife has a 401a and 403b, both of which are in Fidelity.

People throwing out accusations against other people they don't know usually are hiding behind their own infidelities. 

Being in Fidelity, you're set.

I had around 40K in Fidelity 401K account and I rollover-ed to TDAmeritrade when I left the company.

With the money you leave in fidelity, you can invest in stocks and mutual funds.  

I came across a blog stating ” is it possible to build a relationship after a partner cheats” ( https://www.drcohen.ca/general-category/infidelity-blog-series-part-1-is-it-possible-to-build-a-relationship-after-a-partner-cheats/ ).

As I mentioned before - I used a portion of my previous employers 401 (sitting in Fidelity) to rollover into my SDIRA with Pensco, purchased small rental income homes, sold,  and now hold notes.  

I've had tenants with rattlesnakes, drug overdoses, moonshine, a fatality, burglary, intruders, prostitution, infidelity between tenants, and a host of other things that would make your head spin. 

Remember, history is written by the victors -- had our forefathers failed in their attempts to create a new country, we'd all be sitting in British history classes learning about the traitorous infidels from the 18th century who attempted to destroy the righteous British empire but who were luckily brought to justice before they could succeed.

Here is a start I would like to see, to have Muslim's stop calling all Non-Muslims "infidels."