Hi guys,

I've got a LDR going and I love her really much. She does so too, I have no doubt about it, only problem is that we live apart for at about another 4(!) years, only seeing each other during winter and summer break for a month each.

Well because we aren't naive, we agreed on having an open relationship, because I don't want to steal her youth away from her and put ties on her. (and she doesn't want to do that to me too)
I am well aware that I cannot give her everything she needs from me (cool hangouts, dates, sex etc) given the current circumstances, and vice versa she can't give that to me either. But we know we are really compatible and the times we are together, it's amazing. So we want to keep the relationship going until we can actually be together for real.

So there we have the open relationship, and just a few days ago, she told me that she wanted to start seeing this russian guy who studies on her campus. She says she has a lot of fun around him, and just really enjoys his company, but that she and him will have virtually no future, simply because she doesn't see him as LTR material. She's just in it for the fun she's lacking in her life. She also says that she feels horrible for doing this to me, using the open relationship benefits so soon after we agreed on them. (she said she thought it would take a year or so until she wanted to see someone else lol).

I said no, it's fine by me, I'm not an immature idiot and I stick to my word, so if she wants to see another guy that's absolutely okay.
She is grateful that I'm such a great and understanding guy and she really loves me, and I am the only man she feels for. Well that's always great to hear hehe.

So yesterday she and I, after not really communicating for 2 days, wanted to have a nice chat in the evening. Well she wasn't online. I've left her a few offline messages ("what happened?" ,"miss you", "I'm gonna go to bed"). Today is the next day and she still hasn't come home.
Well ofc I assume she stayed over at the other guys house, and I actually have no real reason to be pissed off, except for the fact that she didn't notify me that she wont be online and just basically flaked on me, which makes me pretty angry.

I realized that I get jealousy pushes, but I push them away by telling myself that this is what it's gonna be anyway and it'll be alright in the long run. So do you guys have advice on open relationships? And on how to handle irrational jealousy?
I know that I could try to use those benefits myself, and look for a chick to hang out with, but I don't really feel that this is what I need. Also, I think it would look like I just do it as a response to her seeing someone, which would just look immature.