My (25f) girlfriend (26f) drunkenly kissed another woman

For context my partner and I have been together for 4 years with no issues whatsoever. We’ve lived together we’ve traveled together and we’ve spent almost a year now doing long distance. It also turns out that we were both planning on proposing this year. However yesterday I got a phone call from her telling me that she kissed another girl on a drunken night out. Now my partner has always been a ******* ******** when drunk it’s like she becomes another person. She isn’t an alcoholic and doesn’t drink often at all but when she does drink she has a really bad reaction to it and doesn’t know when to stop. I asked how this kiss came about and she doesn’t really remember all she can tell me is that one minute she was talking to this girl who was a friend of a friend about how happy they were in their relationships (the other girl is dating a man) and the next thing she remembers is them kissing and she doesn’t remember anything after the kiss to give me context. When she called she was sobbing and devastated that she’d behaved that way, she’s told me she’s giving up drinking and will do anything to gain my trust back. Obviously I’m pretty upset by this as our perfect relationship has been forever ruined, there will now always be before the kiss and after the kiss. I just want to know what other people would do in my situation, would this be something you could get over? We are normally so so perfect for each other and I love her with my whole heart I’m just really sad that her issues with drinking have gotten to this point. Please help!

For context my partner and I have been together for 4 years with no issues whatsoever. We’ve lived together we’ve traveled together and we’ve spent almost a year now doing long distance. It also turns out that we were both planning on proposing this year. However yesterday I got a phone call from her telling me that she kissed another girl on a drunken night out. Now my partner has always been a ******* ******** when drunk it’s like she becomes another person. She isn’t an alcoholic and doesn’t drink often at all but when she does drink she has a really bad reaction to it and doesn’t know when to stop. I asked how this kiss came about and she doesn’t really remember all she can tell me is that one minute she was talking to this girl who was a friend of a friend about how happy they were in their relationships (the other girl is dating a man) and the next thing she remembers is them kissing and she doesn’t remember anything after the kiss to give me context. When she called she was sobbing and devastated that she’d behaved that way, she’s told me she’s giving up drinking and will do anything to gain my trust back. Obviously I’m pretty upset by this as our perfect relationship has been forever ruined, there will now always be before the kiss and after the kiss. I just want to know what other people would do in my situation, would this be something you could get over? We are normally so so perfect for each other and I love her with my whole heart I’m just really sad that her issues with drinking have gotten to this point. Please help!