Postnatal depression Relationship help

[MaisieRed]

Hey,
I’m not sure whether I’m the only one or not and I apologise in advance for the long message. But any feedback would be appreciated.
Basically, around 9 months ago (6 months into my pregnancy) I started to feel really distant from my fiancé. Before pregnancy and up until that point I had no doubts at all. I always said we were perfect. We were soulmates and I could never picture my life without him. Then after 6 months I feel more distant. Like I could live without him. Questioning whether he’s the right one for me. He’s amazing so understanding has supported me through this. A very good dad and partner. But it’s me. Every time I feel this I hate it. And dread the next wave of distance to come. Sometimes the relationship feels strong and my feelings do too. But some times these waves of doubt comes in. I question whether I can picture my life with him and whether we should marry. (Weddings in July) I can picture myself living a life without him but I don’t want that. I wnat him. I want to feel like I have no doubts again. deep down I feel love but it’s like somethings clouding it. I have been diagnosed with PP depression. And speaking to therapists they believed it could be due to my past abusive relationship. Who would tell me al the time we would be together forever. And me believing that me and my partner would not last after childbirth so I was preparing myself for that life without him. Thinking of options of the idea of being with someone else. Not that I want that.
I don’t know whether it’s my depression. my hormones, or just me falling out of love. He’s my best friend. I just can’t help but have doubts at the minute

[DustyLee123]

Are you on antidepressants ?
Are you breast feeding ?

[MaisieRed]

Hello,
I'm on sertraline 150mg and I do not breastfeed.

[MaisieRed]

Also how do you mean about the future thing as it would help me a lot to know you're opinion on that