HELP!!!!!SHE REALLY IS CONFUSED.

I had to bring this on here if not my friend lets call her L,would break my head.
L and her boyfriend have being going out for a 8months plus and she says she is tired and has been saying that for the past 3months.

Here's her story she met lets call him "Bayo" mutually at a party because they were sitting on the same table with mutual friends and they hit it off from there.Bayo is very intelligent,generous,sweet and all the works well that was until three months ago,he started being funny,not being his romantic self anymore,lying to her and even saying some not nice stuff to her and she is wondering why.

This is someone that she loves and she thinks loves her,has done everything for and has even endured Bayo's ex calling and all(which Bayo doesnt know).She says every time Bayo comes back saying his sorry and then lying the more again and frankly she is fed up and doesnt know what to do

So my dear readers,pls she needs our candid advice and suggestions pls help.