hiya ruby, I remember you posting about this guy before, it could be that by kissing you he was trying to work out his feelings for you for himself, maybe he doesnt feel sure of himself and you, If he was interested he would have made it plain a while ago when he split.
I dont think this is a runner personally. After 10 years in a relationship I think he will want to try out a lot of different people, he wont be looking for commitment after just coming out of a committed relationship. There are a load of single guys that could offer you much more.