Lately I've been having suicidal thoughts.
What are the reasons behind your suicidal thoughts?
One is because of my ex.
It's good you're telling me. You should tell people when you need help.
It's not that simple especially when she's moved on with someone else. I can't know how to deal with this pain.
That sounds rough, and I think you could benefit from talking to a mental health professional. Counseling is good for times when you're overwhelmed and you don't know how to process what's happening, especially if you're having suicidal thoughts.