I also made an account just to reply to this thread. I’ve read the other replies, but I have a different perspective for anyone who might still be reading.

Over and over, I’ve seen that when a person meets the right one, they stop pining for their ex. They fall head over heels in love with their new partner, and not only do they not miss the ex, but they sometimes wonder what they ever saw in that person.

If you’re in a relationship with someone new but still thinking about your ex, it might be that the new person isn’t the right one for you. They might be perfect for you on paper but not connect with you in the way you really need. A lot of people here have talked about missing the chemistry they had in their last relationship as if they now have to settle for a relationship without it, which just isn’t true. Whoever said upthread that good relationships are boring clearly never had a good relationship that was stimulating and passionate as well as intimate, but there are definitely solid couples who have relationships like that, and there’s no reason you can’t, too, if you’re willing to wait for the right person.

The other issue is that it really isn’t fair to your boyfriend or girlfriend if you can’t give them your whole heart because part of it is still with your ex. It may be that you need more time to get over your ex on your own, or it may be that your current partner just isn’t a good match for you, but either way, it might be better to end or at least take a break from the relationship while your heart is so divided.