You know you are strong enough to cope with every issue. Every couple goes through hard times. Your partner might have upset you again and that was the last straw this time.
How realistic your approach is depends on many aspects. Your excuses of having a kid at an older age may not be reasonable.
Every time you start a relationship, you feel as if you're doing it for the first time in your life. Unfortunately, you can never know how successful and happy your new contact will be.