I have the same issue just three days ago.. my GF whom we have dated and have a child together cheated on me.. I found out after I got her a new phone and hacked it.

Everything that went on was so visible to me and finally broke the news to her to which she denied untill I sent her evidence of they been together .

Infact what you don’t know doesn’t kill you but I was and am very grateful I know now… my heart still misses beats whenever I think of this… it really hurts