In love with two people at the same time

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is it possibe for a person to be in love with 2 people at the same time, a few years back a friend of mine had this problem, there was this one girl he had a very long distance relationship with, they had never met but he was very interested in her and they used to Skype all night long. this friend of mine had been in a very bad relationship in the past, he used to love this girl who left him and didn't tell why she left him, he was very depressed for a while and after a time he just stopped searching for her and moved on and in a few years he met this girl online and he was very into her. then things went sour, a few months into this new relationship the old girl just suddenly came back, and wanted to be with him, he was caught up in all those old emotions, and went basically berserk, first he got mad at that old girl, then he broke it off with the new girl, then he got back with her and then said bad things to the old girl. in the end both the girls left, and he was left all alone, i wonder sometimes if i were in his place what i would have done, but since i have never been in a situation like that i don't know what i would do, what do you guys think, have any of you been in a situation like this ??? what do you think you would have done faced with a situation like this.