<human>: Can you summarize the given text in a few sentences?

I'll try to keep this short...
My boyfriend has this chronic problem of keeping this he's feeling inside, because of some crazy family issues from his childhood. So, when he asked me to come over I (22F) was really hurt and confused when I arrived with my stuff already in a bag by the door. He decided after a weeks contemplation that he was not completely over his exgirlfriend (they dated 8 months) because something he saw on facebook made him miss her. From what he communicated he thought it was unfair to me because he couldn't give me 100%, but that he loved me and cared about me deeply and that he already knew it was a mistake to leave me but didn't change his mind.

My thought process is this: My best friend used to constantly tell me "The best way to get over an old guy is to get under a new one." Kind of crass, but it keeps popping into my head. Why would you begin a serious relationship ( 4 months ago we began dating, 4 months after his ex and him broke up) only to decide you have feelings for your ex so much later? And how can you say you love me if you never stopped caring about her? At the same time, my ex (of two years, we broke up two years ago) just got married and I was a little jealous.

To my knowledge his ex is in a happy place, and I don't think he plans on getting back together with her. I think his internalizing of emotions processing really just translates into him thinking he's doing the right thing to sort it out himself. The biggest kicker os he continues to contact me about how horrible he feels like he has treated me, and how I've never failed to make him smile... it is driving me nuts.

So two questions. One) What can I do or say to him to help him know that I thought he was the One and that I want to help him work it out? 
And Two) When do you really Know that you're over your ex?
<bot>: I (22F) am flipping shit trying to figure out when you know you're over an ex to start a New relationship particularly with my confusing (24M) boyfriend.