I think many people's expectations of intimate relations are waaaaaay overblown and unrealistic which leads to self-sabotage.
Instead of letting love and intimacy grow and develop into a mutually beneficial thing they're like...
"I need him/her to be my lover, my best friend, my support system, my muse, my confidant, my ride-or-die; always ready to have sex, and accepts me for who I am but wait! He/She better not ever get fat, ugly, lazy, emotionally torn, numb, jaded or otherwise offensive to my delicate senses. I need all of this RIGHT NOW and I shouldn't have to actually communicate my needs and wants, pains and desires because he/she should already know how to conduct themselves as an adult in a relationship...Oh and did I mention...He/She better accept me for WHO I AM!"
Like chill out with all of that. Great relationships are built from the ground up and typically do not come as "pre-packaged" as folks want or as those who are in one make it seem. When you see that couple that can't draw their eyes away from each other, the ones who have 3 kids, 2 car notes, 2 jobs, a sick mother-in-law, and a new poorly trained puppy, but still manage to laugh, talk, and smile at each other...you better believe some real and serious work went into that.
I could go on but this is getting lengthy.
I wish there were a love button!