Good morning, OWW, sorry you didn't sleep well. I hate that fuzzy tired feeling when that happens.
I can't give you any reassurances, because I don't know what's going on in your or LM's head, so I'll tell you what I can see from what you've said. I may have misunderstood along the way, so sorry in advance if what I say here doesn't reflect what you think.
You like LM. You and he get on well, and your respective DCs seem to get on well, too. You have fun together.
You frequently worry about where the relationship is going. You start conversations with LM about this, get scared that he's telling you he's not that into you, even though you're not quite sure if you've really understood him right, so you end the conversation.
I don't know what you feel about him, and I don't know what you're looking for that he's not providing. You seem to be insecure in this relationship, but I don't know if that's because of messages he's sending you, or because it's you that isn't really that into him.
I think 6 months is long enough, actually, to decide whether you like someone enough to take it further, but where do you want it to go? If you want to know whether he really loves you or if that was a one-off, then you can either wait around for him to tell you, which you don't seem to be enjoying at the moment, or you can ask him.
Reading this back, I sound very blunt. I'm really to trying to be harsh, just objective, because that helps me when I have a dilemma.