What was he trying to do?

matched with a guy i met on an online dating app, he turned out to be from the same university as me, we still continued to talk. he asked me out on a date. we were both looking for something casual and fun, started talking for a while and then finally met. had our first date, an entire day of doing cute things and then made out a bit, after he dropped me home, we spoke all night , all genuine cute wholesome stuff and bonding, next morning he asked if he could see me again since he was flying out the next day for a trip. this time when we met, we ended up hooking up. and after that also we were in touch, to the point that this guy called me up and told me everything he’d been doing on the trip. after that day, next day we didn’t talk at all; and i ended up finding out that he’s unfollowed me and he had posted a girl on his page , who clearly is his new exclusive girlfriend. weirdest thing is that he unfollowed me and NO ONE else. he’s got crushes that i know of who he didn’t unfollow, and the way we spoke and everything and him calling me to tell me stuff, only for this to happen in the matter of a day!!! SO WEIRD
What was he trying to do?
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