Inside Britney Spears' Breakup: Why It Didn't Work Out With Jason Trawick

"The situation had been building over time," a source exclusively tells E! News of the pair's recent decision to end their engagement

Britney Spears' relationship with Jason Trawick didn't end for some strange, only-in-Hollywood reason. Rather, the end of their engagement came under pretty identifiable circumstances.

"The situation had been building over time. The best thing for both of them was to say goodbye and move on," a source tells E! News about the pair's breakup, which they publicly confirmed last week just as Trawick was legally removed as a coconservator of Spears' personal affairs. 

It turned out that the 31-year-old pop star and her 41-year-old former agent had "different goals" for the long run.

"There were a lot of conversations over time," the source says. "While they realized they love each other very much, they were going in different directions. Britney wanted more kids, and Jason wasn't in the same place so they decided to call it quits.

"There was a mutual realization that there was no compromise on that issue and because of that, sadly, the relationship had no future."

Spears has two sons, 7-year-old Sean Preston and 6-year-old Jayden James, with ex-husband Kevin Federline. This would technically have been her third marriage, if you count her two-day union with childhood pal Jason Alexander.

She and Trawick are "still very good friends and stay in contact," says the source. "They will always love one another and be a great support for each other."

Next step for Spears? A change of scene, perhaps! The hitmaker is mulling a performance residency in Las Vegas, where she could stand to make more than any artist who has set up shop in Sin City to date.