My friends in a similar situation as you. Although, he's made up his mind. At least I hope so.
He started dating a woman who is 34, he's 25(26 next month). They really clicked from the beginning. They sort of broke up a few years back, but then found their way back to each other. Both got jealous of each other dating new people.
We all told him how great she was and how well she treated him. He didn't really grow up in a loving home, so she really filled that void too. My dad (who he respects greatly) always talked to him about the issues you're dealing with. Not sure exactly what he told him but I know it opened his eyes.
Now they have a 6 month old baby girl. She was planned, not an accident.
They couldn't be happier.
I hope this will at least give you the mindset to at least try and stay with her. Nothing is guaranteed in life. When you feel love, you feel it. Go with your intuition, it usually knows best.