<human>: Can you give me the gist of the text in a nutshell?

I'm a sophomore at Cornell (in NY) and he runs a company in silicon valley - we agreed to an open relationship before I left for school this year (previously dated on/off for two years). We are very serious, and he refers to me as the love of his life. I love him a lot too - sometimes I wonder how I landed such an amazing guy. 

We skyped last night and it came up that he hadn't hooked up with anyone and I had been hooking up with a guy at my school and he didn't take it well. He didn't guilt trip me or anything even though I know for a fact that he's been avoiding very attractive girls that have been asking him out (he's very charismatic and good-looking, also helps that he's 21 and has already made millions on his own). He just suggested a break, we are still on good terms and  plan to see each other over break.

I feel terrible. I'm not sure what's going to happen in the next three years before I graduate. Was doing an open relationship silly in the first place? He did it for my sake (because college) he would've had no trouble not hooking up with other girls while I'm gone. If I have trouble staying loyal does it mean I don't really love him? Or am I just not mature enough yet? Maybe it had something to do with how I was hooking up with the same guy here? Is there any chance it'll work out?
<bot>: Open serious long distance college relationship with incredible guy. He hasn't hooked up with anyone, I have. He suggested a break after I told him. Not sure where to go from here..