The need for closed relationships?

I am ever curious about open and closed relationships. I can see the need for both, but I think trust is more important than both. If you can trust that you are good enough for them to want to come to you, and to never stray or want anyone else, then good for you, but are you being naive? And what about matters of the heart, when should they come in to play?

I am curious about this as I have recently been looking at getting into the dating scene, and what is it that I want? Open, or Closed?

Open has it's appeals for me, I would be able to travel, and if I saw someone I liked, not feel the guilt, I would be able to try new things, and I'm not sure all my needs would be taken care of by just one person. The downside of this, of course, is the other half of the relationship wanting others just as I do, if I was to ever want to settle down and have something most serious, would the other be able to too, what if I was to fall pregnant? Open relationships are more a false sense of security where this is concerned, but at least I would be able to enjoy myself with this person and others. This is more the short-term for me, more the pleasures of the flesh and not so much of the mind, and of course the heart.

Closed relationships are more the way to go, but I would not be able to explore different parts of my sexuality, and when I traveled I would not be able to pick up as I pleased, but at least I would have something that (seemed) more reliable and something serious to fall back on.

The problem I see is if I get into a relationship with someone, and I only think it's monogamous, and it's really not, they are really with other people, and I am only blind enough to think it's just me and them. I would be wasting my time and throwing my heart in the deep end, when I could have just been out there enjoying myself on my travels. But as a good friend of mine once said, you can't keep your heart in glad-wrap forever. You have to throw it out there, and cross your fingers that someone will catch it, and that that person will be the right someone for you.

Ah, such is human relationships in all their glory.