honestly my personal stance on this might be very different from yours, but here’s a short overview:
people seek security in life. people don’t want to be left out or left alone; this is why people get jealous. You need to find a stable social and economic basis in your life. Otherwise, you start clinging to other people, and that can’t be good.
people seek social contact. that is why people go out and find other people that they’re attracted to. that doesn’t mean that you have to spend time with exactly one other person. make contact to lots of people, so there is enough diversity. think of it that way: you wouldn’t eat the same thing every day, for the rest of your life. you need some changes sometimes.
do not get clingy. remember that people can fail on you for any reason, be it accidental death or sickness or simply their psychological fuss. Don’t assume that a person that you spend time with today and love very much will be here for the rest of your life. Assume that the relationship might end or decrease in intensity within a month or three. then, build your actions on these assumptions.