<human>: Can you give me a shortened version of the text?

Doing trans-atlantic long distance with girlfriend of almost a year. Just found out I've been offered my dream PhD here, and it will be 3 years until im back living near her. She has to stay where she is for work too.

We've been trialling an open relationship for the past few weeks, starting with making out and working up to sex, under the premise that 3 years, despite frequent visits, is too long to not be with other people. It is open just physically, so sex with others is ok as long as no emotional connections.

The problem is, I love this girl, and in no way whatsoever do I want to get with others. I'm pretty much physically incapable of wanting to. On the other hand, she has already started getting with people and is very happily moving forward. I'm having real difficulty coping with this. Also to note, she is definitely a lot more sexually active in general than me, so I understand her need for sex/light dating while apart.

I love her so much and want to do everything I can to get from now until we are reunited. If that means open relationship, so be it. She says she won't be able to handle the time otherwise, so the only other option is breaking up now and then getting back together later, which neither of us want to do, and I think 3 years is too long and we would grow too far apart without contact.

What can I do? I'm being torn up inside trying to be ok with her getting with other people, I'm really struggling. Will it just get easier with time? I've never done anything near an open relationship before, so part of me thinks this is just the acclimation period. I also think maybe I just need to go out and have sex with someone else, but right now there is nothing I want to do less.
<bot>: Beginning open relationship with lond distance girlfriend as the only means of making it through the next 3 years apart, and it's tearing me up inside.