Why does he seem jealous and why did he send me a pic out with friends?

Anonymous
I've been talking off and on to this guy since the end of October. He has canceled plans on me a few times, because he isn't ready to date yet, and honestly neither am I (recent bad breakups for both) I took a trip out of town recently and he wanted to know what kind of friend I was visiting, whether it was a guy or girl or an ex. The same week after I got back from the trip, he randomly sends me a pic of him out with friends having a few drinks with the guys, why get jealous and why send me a picture, the same picture his friend posted it's like he went out his way to make sure I seen the picture? To make me jealous or? I posted a pic of few days ago from my trip and he recently liked it, which ik probably means nothing.

Im probably reading too much into it, but I relatively inexperienced with dating.
Why does he seem jealous and why did he send me a pic out with friends?
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