A multitude of reasons could be generated why certain behaviors occur in social interactions. Sooo uhhh don't sweat it, maybe if someone is giving you signals of disinterest forget them and move on. The outside is easier to gauge than the inside. Less work to discover. Idk shit's confusing.
Well, when people look for a life partner they are looking for a sex partner as well. sadly this means that they need to have some kind of sexual attraction to you. what makes a person attractive varies from person to person. We all know that beauty is skin deep and will fade with time so we try to look inside for more substance to make a long term relationship. So, that said, a guy might chat with some they may think is moderately attractive and try to get to know them to see if there is any chemistry. they may find that they really like this person and that person becomes more sexually attractive. or they may find the person to not be what they want and will want to b friends or nothing at all.
Personally, i try to give everyone a chance. u never know if that guy who u think u'd never date is actually the one for u until u try. more than likely u will make a lot of friends and few lovers.
Not sure what u mean by looking away but it could just be that they aren't interested. if so than leave them and move on. but always be a gentleman. its best not to make enemies.