Go alone. AlAnon is for you. They usually recommend 6 meetings before you decide if it's right for you, so I would plan at least 6 by yourself. Just plan to go and don't make a big deal about it. If he mentions going, say "No thanks!" and leave. Once you've been going for awhile you may bring him IF it's an "open" meeting. But I think you will soon learn that you like having your own safe place to listen/talk/learn.