Fiance mental struggle

Is this wedding related only or does it occur with every day life situations as well? Is there something specific that triggers this reaction in him? Triggers are a normal PTSD response to past trauma (emotional/physical, etc). Has he seen a therapist to work through these issues? That is going to help him function on a daily basis when triggers arise. You can be there to support him by being someone to talk to when he needs or making your space safe for him to decompress.

He does struggle with everyday situations. Right now he's scared about introducing me to his friends because the PTSD that he is experiencing is introducing the girl to the friends because his best friend stole is girlfriend. So his girlfriend cheated on him with his best friend. he knows that won't happen again but just working through all the problems. He hasn't been to therapy for this because he has been determined to work it out on his own.

Personally I would hold off on wedding planning until he finds a therapist he’s comfortable with. There are many online if you don’t want to somewhere local. Dealing with PTSD is normal for some people even if it never fully goes away but that is a red flag that needs to be addressed sooner than later.

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I am worried about holding off the wedding because of other live circumstances.

PTSD isn't really something you can work out on your own, especially when you've got other stressors going on in your life (like trying to plan a wedding). Especially if he wants to be in a better place by June, I would suggest he looks into therapy. Otherwise, can you guys plan a smaller, more intimate wedding with just family right now and have a larger reception later on with friends once he's doing better? You can support him as best as you can as he's working through it, but PTSD is a demon he's going to have to face mostly on his own until he's at a point where he's comfortable with you meeting his friend. At that point then you can provide comfort and reassurance that you wouldn't choose the same actions as his ex, but he needs to get there first. It's all about little steps.

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What circumstances are you talking about if you wait to have a wedding? You will be so much better if you wait until he has worked out his demons.

You do not want to marry someone who is not emotionally ready to get married. Your marriage WILL fail.

You support your fiance by encouraging him to go see a therapist; and postponing until he is ready. Make him feel that his mental health is the most important thing to you and you are willing to wait until he has addressed this.

If he's insecure about "his friend stealing his girlfriend," that sounds like there's probably a perception issue--his girlfriend probably had a hand in it too. People are not objects you can't steal them like a wallet. He feels betrayed by his friend, but he is bringing that into your relationship. If you think something is going to happen, you have a much higher chance of it manifesting.

And stand by your commitment. No more wedding talk until he is ready.