I dont know what ppl stands for, but if you are talking about how to have a long distance relationship? this is what I think. long distince relationships are very hard. they make you wonder if the person you are with is staying faithfull to you and most times have a lot of indiscretions. I think it comes down to the people that are involved in it. I have 2 friends that have been in a long term long distance relationship. they have an open relationship. when they are together ( in the same state) they are anly about eachother. but when they are apart they go on dates with other people. they keep eachother informed about what is going on and are honest about what they do with other people. sometimes it is hard for them because they love eachother but knowing what the other person is doing helps them to stay together. it sounds weird I know, but it works for them. I think that if you work hard enough to have a honest, open, loving friendship then everything will fall into place.
Good luck