I recommend that you tell him that before he comes home that you want to know the reason(s). IF he doesn't give you the correct answers, (and don't compromise on what answers will make you feel safe that he WANTS to be there for YOU and the kids) then tell him it is a lot to digest right now and that YOU need some time to think. If he asks you what you want to think about then tell him that you just need time to think and are not sure how you feel right now. (keep on that theme)
Remember the main key is NO PRESSURE. Don't reveal how you feel right now. Tell him you aren't sure how you feel because if he can up and leave so easily once, then he can do it again and that you don't want to live with someone like that.
Be nice, be firm, be confident and don't be easy. Don't say too much. Be matter of fact. IF he says the correct things then your answer is still somewhat the same. You want to know what is preventing him from doing it again. You won't allow it to happen again because you will be DONE. If that is all he thinks of marriage and relationships, then you don't NEED it. (this will also set you up in good shape if he should happen to leave again because you will be able to remind him of what YOU said and that you MEANT it.)
Do you see what can happen when you make a man curious by creating mystery? Don't underestimate those flowers and the way you have behaved in the last few days. It is WORKING.
