This is just my 2 cents so you can take it if you wish. I have been around this before, and Warbaby is right. If you are already having issues now, then I fear they will not get any better by taking the relationship further. Let me clarify, at least it didn't with my now ex-wife.
The best of luck, but the only one that can make that decision is you Sir Russel, but I think you have already made your decision.