Should i stay with my boyfriend who has a for bald women?

My boyfriend has a with bald women and I think it's going to split us up. I love him so much but every time we cuddle or have , or he touches my hair, I can't help but think he must be wishing I was bald. The whole time we have I'm wondering if he's fantasizing about bald women. I'm so scared he will meet a bald woman one day and will be so overcome with lust etc that he wont be able to stop himself from acting on it. we have an 18 month old son together, who is the only thing that keeps me going sometimes. i know its not my bf's fault, but i just cant get it out of my mind. i only found out about his because i saw some of the videos he'd searched for on youtube. i felt so sick knowing that i will never be what he wants, and that he couldnt even tell me. he denied it for ages after i saw the videos. i just dont know what to do. i love him so much and dont want to split up, but we're making eachother miserable so maybe it would be better if i just ended it now, to save any more heartache. maybe it would be better for us to end it before my son remembers us being together, so he wont have to go through it as bad as older kids. argh, i just dont know what to do for the best...help!!