Don't ignore your gut feeling/red flags thinking love will conquer all and make everything okay/better. It needs to be good from the beginning.
Actions may speak louder than words, but words still mean something.
Stand your ground. Don't let anyone intimidate/guilt you into staying. They do not own you, and you don't owe anything to anyone.
Walk away from alcohol/drug use. You can't save them. They have to want to save themselves.
Do what makes you happy. Chase your dreams. In the right relationship, you can have it all. A relationship should not entail sacrifice (unless you're sacrificing sleep for late-night sex!
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