Im at the brink of leaving him?

i have tried everything to make him happy.i express in many ways how much i love him . we hang out we are buddies. but something is not right. my husband is in the navy . i have had trust issues based on cirstances he has gotten himself into. he has made me cry over and over again and made me fall for him over and over again. at times i think he is an angel and other times i look at . him like he is just another Navy sailor ,stupid and selfish. now i have discovered for the third time he is looking at . it has gotten to the point were it is several times a day and picks the computer over me. i do not feel y i do not want to do please him anymore. i feel like i have been giving to much and this is what i get. im very young only 20 he is the only man i have ever been with, and he does this to me. i do not feel appreciated when he is gone im so faithful . i feel guilty if i smile at a man. but i can't take it i don't even want to sleep with him anymore. im suppose to trust him when he goes out to sea. he has secrets when im there with him! he goes on deployment again in a few months and because of how much he has hurt me im afraid i will cheat on him. im tired of being used like a toy. he can look and i can't. i think i need to leave him i can't take it anymore im too young for this.