Am I jealous or over sensitive and what should I do?

Last night my boyfriend took me to Hooters for a beer after work. He talked super long with the waitress each time she came. Later when I went to the bathroom when I came back they were chatting and as soon as I sat down, she left. Later when she came back he asked her if he could buy her a shot and invited her to hang out on Thursday at another pub we go to because she doesn't work on Thursdays.

I am 23 and he is 28. (This is from my mom's FB account for so the age is wrong).
Oversensitive
I would feel the same
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Am I jealous or over sensitive and what should I do?
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