NC for this.
I've been with my current partner for just over three years, and am currently very happy with him. I'm close with his family and mum in particular, and it's by far the happiest I've ever felt in a relationship. We discuss the future a lot, and I can see myself getting engaged to him.
I also have a close male friend, whom I've known basically since birth (his mum and my mum were friends) and have been particularly close to for around 10 years. He's one of my best friends. It's also important to know he's single and straight, but there's never been anything romantic between us.
BF and best friend have met on several occasions, and have always been able to get along amicably, but recently I've found it increasingly difficult to keep the peace between them.
I met up with my friend last week for a walk and to exchange Christmas gifts - something we've done for years (long before I got with BF). My friend has had a tricky few months and suffered an MH crisis in September, and so naturally I've tried to support him as much as possible, texting regularly and just checking in on how he's doing. So, anyway, on the gift tag for my present, my friend wrote a lovely message just saying how thankful he's been for the support and how I was 'a one of a kind friend' and how he'd be lost without me.
The trouble is, I think my BF is a bit insecure of me having this friendship. For instance, earlier in the year my friend bought me a very generous present for my birthday, something I've wanted for years (but never said as much), and my BF was a bit put out that my friend had bought it me.
This weekend, BF came over, saw this Christmas present and read the tag. I could tell it was playing on his mind a bit, and then later that evening I left my phone unattended and he started going through my messages. My messages with my friend are purely platonic, and lately have been very run of the mill - organising meet ups, saying what time we'll be ready etc, nothing remotely inappropriate. But we always sign our texts with xx or xxx.
Anyway, my BF was being moody and I asked what was wrong. He said he'd be more comfortable if me and my friend didn't sign texts with xs anymore. Fair enough, I sent a message to my friend explaining this, but saying that he'd not done anything wrong.
A bit later my friend replied and said he understood, but said he was a bit hurt that I'd let my BF read our messages and now feels he can't confide in me as much anymore, because he fears anything sensitive relating to his MH etc will be read by BF, and how he feels BF 'clearly has an issue' with him.
I don't know if this is my fault or not, but I feel stuck between a rock and a hard place, between two people I care deeply about. What should I do to keep the peace? I don't want to upset BF, but neither do I want to lose my friend either.