I don't know what to do?
What Guys Said 1
Anyone can just say that. "Oh I love you so much" "you're the best thing that has ever happened to me"... Etc. Words are so extremely easy to put out so you should never rely heavily on them however actions on the other hand is what counts, by observing his actions, it looks like he cares a lot less than you do (I might be wrong) and his actions contradict his words to an extent. Maybe just leave him (like pretend he's not there) for a while and see if he comes back, if not, then maybe it's time to move on, but if he returns and shows more interest then you're safe ;)
What Girls Said 1
Guys only talk when they WANT something, usually to quell their pests, e. g. stomach, penis, etc.
That said, if anyone gives only one word answers all the time, acts mysterious then one or more of these are suspect:
They are keeping you around but are shopping replacement candidates
When they talk about things, they get more than they bargained for in back talk or criticism, or... ?
When someone already knows you would be against their great/coveted idea, they will withhold all plans to activate it until after the fact.
They are damn tired and the refreshment they require cannot be served up by you
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