I don't see myself having a relationship with anyone...

I've been doing some reflecting lately and going over problems with guys that I've had, mostly just them talking to me which doesn't really happen so I start getting interested and things are great for a while until he becomes distant and eventually stops replying and generally ignores me and now I've just been looking around me and I just don't see myself having a real relationship with any guy. I don't see myself dating or even getting asked out. At first I thought I was demisexual but now I'm thinking asexual.. is it just a phase?