I need advice badly?

So me and my boyfriend also, the father of my son, have had a rocky relationship for 4 years. He's gone behind my back plenty of times and I forgave. Never physically cheated that I know about, but would go on dating sites trying to hook up with other girls. Well recently we tried working on things and he took me to Galveston this weekend with his cousin. We were drinking alllllll day, and we went out to the bars that night, apparently I kissed a guy in front of him whom I didn't even know. I feel sick to my stomach. That isn't something I ever do so I'm at a loss of words. I can't eat, sleep, or even want to function. I feel so bad. I'm 100% loyal to him so for me to do that blows my mind. I love the guy so much, and I just feel so broken. I fucked up and I never do. It was such a big eye opener though. I'm obviously not good with drinking so I'm done for a long time.
Did I fuck up badly?
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What do I do?
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I need advice badly?
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