I'm not sure what advice to give in regards to who you met online. But I think whether you pursue anything with him or not, what you should really focus on first is the relationship you're in now.

If your not happy in your current relationship and haven't been for a while, you need to really think about if you should continue to be with this person whether you are pursuing your soul mate or not.

Last summer, my ex and I ended a three year relationship. I had been unhappy in the relationship for about a year, but could never bring myself to end it because I did still care about him and I didn't want to hurt him. Eventually, he ended up realizing that I didn't love him, and he left me. It still hurt, and it was still hard, but now I am with someone who I love more and am more happy with than I ever was with my ex.

I guess what I'm saying is if your truly unhappy, you should rethink the relationship. This is not to say it will be easy. And I don't think you should base your decision on whether you think anything will happen with the person you met online- because either way you deserve to be happy, and even if nothing happens with the person online, you should be with someone who makes you happy