The dating game it tough, people are always looking for something better. Maybe it's just human nature.
If you ever need any woman advice I am always here, being one I understand how they think.
Hope things get better!

ask away, I don't mind!

Well looks are usually important for first impressions if you approach someone in a bar or something. But I think if anyone didn't give you a shot because of how you look, then they are shallow and not worth your time. Generally girls will prefer personality over looks, because having a dependable and sweet guy is more important than anything else, and liking someones personality also affects how you see them. As long as you are charming and can approach well, you are all set (plus you are cute so you shouldn't worry).

I think typically both women and men eventually get bored in a relationship. Humans aren't monogomous by nature and it's pretty uncommon that people stay interested for an extended period of time. Most people who stay together, stay because their relationship is dependable and comfortable. For example older people, they have been together so long, they know each other inside out.. why bother change, it's unlikely they would find a new partner after all that time. But younger people, it's a lot easier to seek out a new companion.