I've seen so many threads here from women who are drowning in a sea of fuckwittery doled out by the men in their lives (and men being fucked over by women too I guess but I haven't actually seen any of them). I know when I was being lied to and cheated on I had forgotten what to expect from my husband and in some respects it allowed the cuntery to go on.
So I'll start....
A healthy relationship means feeling like you are the most important person in your DP's life. Not equal to or beneath their mates, their brother, their mother or anyone else. Just you and your lovely children.
And sex should happen, when you both want it. But it should be happening.
What else?