I really don't know what to do and I'm not sure posting here Is the right thing either but I'm worried about her.
Her and her man were together four years then split for 2..
They have been back together a year and a half.
He has just told her he thinks he caught a sti from another girl while they were on a break. Over a year and a half ago.
He has apparently just realised and asked them both to get checked
He has apparently had no symptoms.
Does this not sound suspicious to you?
I think he's cheated but she listens to all his lies.
He talks to her Like crap only bothers with her one day a week.
She doesn't know her worth 
How do I help?
Do you think hes has cheated or am I jumping the gun?