Hello LiterallyLawyer: I noticed this is your first post here on PC. So... welcome to PsychCentral.

You asked how long your bf's jealousy will go on. I don't think there's any way to know for certain. It really all just depends on him & what is driving his jealousy. But I think the more significant question is what can be done about it. And the answer, perhaps, is some counseling or therapy for him & / or possibly some couples counseling for the two of you.

I've been married for 39 years! And I'll tell you it takes an ocean liner's worth of compassion & forgiveness to keep a relationship going for that long. So if your bf is freaking out at this stage over the fact that you had 3 previous relationships, he is perhaps still quite immature & this may not bode well for your relationship going forward... sorry to say. On the other hand, if he realizes & accepts the difficulty he's having & is willing to work proactively on it then that's a very good sign indeed!

Here are links to 7 articles, from PsychCentral's archives, that hopefully may be of some help with putting what is going on into perspective. (Numbers 4 & 5 are by our host Dr. John Grohol, Psy.D.) The articles may be appropriate to share with your bf as well since it is he who is experiencing the jealousy. Also included is a romantic attachment quiz you can take:

Retroactive Jealousy vs 'Regular' Jealousy in a Relationship

Don't Ask Your Partner to Erase the Past

8 Healthy Ways to Deal with Jealousy

5 Secrets to a Successful Long-Term Relationship or Marriage

8 Ways to Ruin Your Relationship

https://psychcentral.com/blog/improv...relationships/

https://psychcentral.com/quizzes/rom...tachment-quiz/

I hope you find PC to be of benefit.