I actually don't think I can help you too well on this one, Beschatten. When I was in the position you are in now, the "solution" I decided to subscribe to was just to not do relationships anymore. Maybe it's a mistake and maybe I'm just limiting my options, but I'm doing pretty OK with it so far.
However, there is one thing I can tell you that may help. In all my experiences with girls and in all my efforts to achieve self-actualization and enlightenment, I've realized something about that compassionate loving feeling between you and the girl you've got your arms around.
That feeling can only exist in present tense. If you try to assign that feeling a place in the future, or if you try to find evidence of its footprints in the past, it's going to disappear in the present, and it'll surely disappear from the future, almost as if it never existed in the past. I think, that to breed that feeling, to strengthen that connection in a relationship, you must keep your focus on the great feelings of compassion and passion of the now, and so should your partner.
It's almost like a metaphor for life. If we're just thinking of the past, we'll just keep living in it, stuck in a cycle. If we're worrying about the future, like obsessing over death, over the end, we'll never open our eyes to the now that's in front of us. Only when we start enjoying life now can we be happy.
So, my shoddy relationship advice to you is this: don't try to "save" it. Just start enjoying what you two have together at the very moment you're living it. I think it'll make the two of you happier in the relationship, and, ultimately, it's going to save it. The Taoists call this concept Wu Wei, which means "do without doing."
Hm. I guess I can try relationships again.
...after I graduate from college.
