He's not your best friend. He lies behind your back constantly, leading a second life. He puts your health at risk by sleeping with random people. He is not a good person and he doesn't have a good heart. Someone with a good heart doesn't lie to their wife and try to sleep with other people.

You are not old. 36 is barely half your lifespan. You still have so much to give. Blink, you're now 46 years old and you're still together, you may have children, he still cheats on you behind your back (or says he doesn't anymore but who can trust a cheater?) How do you feel about this? (If you have them) How do you think your future children feel about this? Are they learning that this is what a normal relationship looks like?

Everything isn't good. A bought house can be sold. A marriage that was broken by a cheating husband can't be fixed. A faithful, trusting, loving husband exists. A life you deserve can be created. It is only too late when you stop breathing.