Another point to bear in mind is that many of us are actually trying to get back to he person we were when we met our spouse. Change is certainly possible, because we've ALREADY changed! The everyday complacancies, lack of appreciating your spouse or spending time together, not making an effort for them. These are things we once did, so certainly we can do them again.
You cannot teach a man anything; you can only help him discover it in himself. Galileo Galilei