One of the more important points people rarely make about successful NSA relationships is that you both have to be mature enough, and emotionally ready, to embark on this kind of relationship. An NSA relationship will never work if one or both people are jealous, immature, needy, clingy, or not in the right headspace for one. You have to have the level of maturity to understand that they don't need to be your only partner and that you don't have to be theirs either. There's no room for jealousy in this kind of relationship because neither of you "belong" to the other, or have made any commitments to each other. You also can't smother them with attention or expect them to do that for you. If you're asking for more than you agreed upon, a no-strings-attached, sex-only relationship, and start asking for emotional support, their time, etc., it won't work out. They may get overwhelmed by you and realize you're not holding up your end of the deal by asking for more than what the relationship is. So, take the time and assess yourself to see if you really can handle this kind of relationship before you drag somebody who is ready into your mess.