Why can't I end my relationship when I am not fully happy? Please, I need serious advice...?

You are NOT happy & that's a FACT!!! Why you are holding on to this "person" is strictly because you don't want to be alone! That's it in a nutshell!!! But, if you'd think about it a bit, give yourself a chance. You KNOW darn rite well you are NOT going to be alone forever! Maybe for a short time, I'm sure you do have at least a friend you could talk to or at least a someone. You're not the only person in the world & someone WILL come along IF you'd just make yourself FREE in order to even find them. You have the person who is NOT rite for you, but there IS a rite person out there just for you. In order to find him, you must let go of this one who is doing absolutely nothing for you. "IF he would do like a complete 360", but he's NOT!!! He's NOT the rite one for you & accept that fact. You DO want the rite one but are not going to get him until this one is gone. Let go of him & give yourself at least a chance. Don't you deserve it?! You sure do! So DO IT. Put the past in the past & leave it rite there. The past is forever gone, the future is still our own. Make a conscious effort to work on getting your happy future! When the time is rite, the rite one WILL come along for you. Give yourself the chance you so deserve. You CAN do it...DO IT...:)