Let's get right into it;
1. You come first.
You are your number one priority, no matter what anyone else says. You need you more than you need them, trust me. Even if your partner is just as giving and loving as you are, you always need to take care of yourself. If you don't take care of you first, nobody will!
Sometimes, people are really good at taking and if you let them you will slowly become a host for parasites to feast on.
You also have to take a good care of your mental health. It is when you are healthy and your Sanity is in check that you can help someone else. Don't stay in a toxic relationship because of what people will say. Remember that if anything happens to you today, the same people who claimed they can't leave without you will move on the instant you are gone.