I think My boyfriend is becoming possessive over me. Is this a red flag?

I've been seeing my boyfriend for 10 1/2 months , he's a ok guy over all but these last few weeks since he took my virginity have been strange. To back it up a little bit I lost my virginity to him march 5 on my birthday last month. The experience was ok, when I look back I feel like he talked me into it. And after when tried to go home to get ready for my classes the next day he wouldn't let me leave. Later that night after he fell asleep I sunk out of his place to go home. He wasn't to happy about that said that made him feel a certain way not waking up to me like he planned, and also said " I was scared you left forever". Since that he's been acting strange like I said before. He always wants me to send him snaps of where I am or going like what classes I have for that day. When I don't he gets upset and acts like a child. About a week ago I posted an innocent snap of me and this guy who was my class partner in bio ( I'm in college btw) . My boyfriend sees it , leaves his class and comes to mine says he needs to see me it's an emergency and takes me out of class. Grabs my hand pulls me into the men's restroom and starts making out with me. I was honestly scared. I told him not to do that anymore and he says " find a new parther" . I really like my boyfriend but this is becoming serious I think. Are these signs of possessiveness.
I think My boyfriend is becoming possessive over me. Is this a red flag?
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