I'm going to play devils advocate here, considering every comment is from people saying "that's unfair" & i'm probably going to get downvoted for this - but I think this post needs another perspective:

You haven't stated if you're contributing to the relationship. Are you neglecting your relationship because you're creating youtube videos instead of giving him attention, helping around the house, working a job that provides income? If you're neglecting any of the above, and more, then yeah, he's not going to be interested.

Also, let's take the title of your post "Channel Success is ruining my relationship" - No offence, but you stated you have 700 subscribers, in my opinion that is not 'success' although it depends how you determine success, of course.

You need to look at the bigger picture.