<human>: Condense the text into a few key points

So as the title says my friend has been in a rocky and toxic relationship for several years and recently got engaged. He has talked about breaking off the relationship several times and has asked if he can move in with me (they live together). I have told him my house is open to him any time. 

He has never followed through. The farthest he has gotten is borrowing my SUV to move then returning it empty and apologizing.

I have talked with him before when they broke up after about a year into the relationship saying that they weren't good for each other, ect. 

When he came to me about calling off the engagement I tried to stay unbiased and let him work through his thoughts (mostly because the talk several years earlier put a strain on our friendship) and not offer to much of my own opinion. 

He knows that they are both "just going through the motions" at this point. Partially due to the age difference this is going to end 2 ways: 1) they break up or 2) they stay together and have a kid(s). 

I am looking for advice as to what to say to him.
<bot>: Friend is in a bad relationship and is engaged. Talked to me about breaking it off and moving in with me til he can find own place. Hasn't followed through. Looking for advice as to what to say to him.