I'm going to write the last week's events in bulletpoint form, because it's so ...lengthy and OTT tbh. 

The question is: am I going mad, is it BPD, or is he a bad boyfriend? 

Here we go...!

* Go on holiday for a week 6 wks ago
* Returns. Boyf becomes distant. Stops being around as much
* I get the Mirena coil out - see my alt post for more info
* I tell my longest friend that he needs to accept we're exes, and he removes me from his life. my boyf officially becomes my FP
* 1.5 week after coil is out, and I'm a lot less moody &amp; clear-headed. Boyf tells me he's texting a girl he met on Tinder. (Note: he was on Tinder so we could find a third. Said that it felt like cheating talking to other girls, so he deleted the app)
* Tells me she's "interesting" and that in the 6 wks we'd been growing distant, some days he'd spoken to her more than me
* Tells me the main thing he talks to her about is getting 'closure' over his ex, and is deciding whether to message her or not, bc this may or may not bring up feelings
* I accept this and talk to him about it, but mull it over and then wonder why he even cares, begin to overthink...
* I go into an episode that I was in for around 4 days, and get an appointment for medication (I'm off them atm)
* my FP switches from my boyf to my long distant friend that I've had feelings for for 10+ yrs, but we've never met
* I calmly (and yes, honestly, it was calmly) bring up the ex situation again and he implies that I have 3 personalities that he has to run everything by. I throw him out of my apartment
* today he comes around apologising and saying he needs to be better
* my long distant friend of over 10 yrs admits that he likes me too

This whole situation is one of the main reasons I joined Reddit, so I could get other BPDs and BPD partners opinions.

Am I blowing this out of proportion? 

He and I have been together 8 months, he has a key to my place, he avoids talking about moving in, he leaves his stuff here but rarely stays over, we've met each other's families, and been on holiday abroad together. 

He says he wants to talk to the ex for closure, and that he spoke to this other girl from the dating app because she's anonymous and won't judge him. It all makes me feel like I'm not enough, and I'm wondering if I'm splitting on him. 