The dilemma I’ve been in a relationship for four years. It started as a workplace affair, but we fell madly in love and knew we wanted to be together forever, which meant leaving our spouses. She went first, informing her husband their marriage was over. But she did not tell him about our affair. They agreed to separate and all was amicable. When I confessed, I was able to end my marriage, but not without difficulty and revenge acts. Neither of my children has spoken to me since, despite my efforts to reconcile. Three years later, my partner and I are still together. It’s mostly very good. My problem is that she retains a strong relationship with her ex. I understand this is good for co-parenting, but it makes me uncomfortable. She hasn’t divorced him or made any effort to – even though I made a point of getting a divorce to ensure a clean start. In contrast, my ex-wife and I have never been able to have a polite conversation. She is spiteful, vengeful and constantly asks for money. I appreciate my actions have had consequences. However, I struggle to manage my jealousy and fear my partner will return to her husband. It feels as if she is keeping her options open. Am I being irrational?

Mariella replies Just a touch. You do seem to be ignoring the obvious, which is that your partner’s approach is netting positive results while yours has created only adversity. She’s engineered a departure low in acrimony while yours is marred by misery. I’d put money on your being one of those impetuous lovers who doesn’t like to let detail get in the way of an increased pulse rate. There’s certainly romance in the notion that the right two hearts would forever beat in unison and previous commitments were merely training for this, the real thing. It’s also a pretty naive stance to take.

Rushing from one relationship to the next, swearing undying love and tying yourself up in hard to untangle commitments is beset with obvious flaws. It may play to your sense of insecurity to believe that your new partner is hedging her bets, but a better way to regard it would be with a degree of admiration for her superior wisdom. She’s managed to elegantly detach herself from her marriage without causing undue emotional misery and excess pain. Now she’s embarked on this relationship with you, but without the same determined disregard for past experience. Instead, she would appear to be carrying with her the lessons from her first foray that include the possibility, hard-earned, that wanting a relationship to last forever and achieving that goal are two separate and sometimes unreconcilable ambitions.

Your new partner seems less impetuous, mindful of the pitfalls

For many, their first wide-eyed love affair will struggle to last the elongated journey that our increased lifespans now provide. Sticking together for up to 80 years is a tall order and we could all do with lowering our expectations. The mistake you’re making, and it’s a common one, is to plough on without a moment to digest the experience you’ve just emerged from – which makes you the proverbial old dog! Your partner, on the other hand, seems to be proceeding far less impetuously, at the revised pace of one set on her path but mindful of the pitfalls. That does say something about her expectation of your relationship – not least that it’s imbued with the wisdom of past experience.

Tying another individual up in public statements of intent and transforming irrational impulses into set expectations doesn’t make it any easier to keep them on board – as both your exes have discovered to their emotional cost. The fact that you see your current partner making a similar commitment as the only way to feel secure about your hold over her deserves further scrutiny on your part. It suggests that what you are in pursuit of this time around is no more achievable than it was last time.

I’ve no doubt your wife was furious you were breaking promises that she felt were non-negotiable. You’ve proved her wrong by leaving her and now you want your next partner to make those same unrequited promises all over again. Think about it – it really doesn’t make sense. Embarking on a relationship preoccupied with how swiftly you can create an inescapable institution doesn’t bode well for the success of the enterprise.

Many of us will move on from relationships that aren’t perfect or have lost their allure over time, but life is supposed to be a learning process. I appreciate that the world today may not encourage belief in that concept – and your determination to declare your current pairing a “together forever” situation when you’ve already broken that promise once is just another indication that as a species, we still have a lot to learn. I suggest you enjoy what you’ve got – and when you are content enough not to care whether she commits publicly or not is the perfect moment to get remarried.

If you have a dilemma, send a brief email to mariella.frostrup@observer.co.uk. Follow her on Twitter @mariellaf1