....I was surprised by the nature of the messages eg signing off with lots of kisses, saying he'd hope to meet someone as amazing as her. He has promised 3 or more times that he wasn't going to contact her again but when I've checked his phone (yes I know terrible) he's continued to be in touch alot. The most recent correspondence was saying he was having a wobble and saying he missed her...
he's said he thinks Im too good to be true he can't believe his luck etc.
To me, these two things are at odds.
If he thinks you're amazing and can't believe his luck, why's he been in contact to a fairly inappropriate level with his ex, gushing at her, signing off with lots of kisses and repeatedly getting back in touch with her even though you were uncomfortable with it (I think understandably) and he said he'd stop the contact.
On any of the occasions you found out he was in contact with her, after saying he wouldn't be, you could have ended the relationship. Yet he kept doing it and took that risk.
He claims him telling her he misses her was just as friends, I'd have my doubts.
He claimed he only had the "wobble" because you checked his phone. That's a convenient cover, throws things back nicely onto you. It's your fault he had the "wobble". I think he'd have been having it anyway.
She's quite far away, she told him she couldn't love anybody (that included him) she's seeing someone new .... He's kept in steady, "affectionate", gushy contact, he's kept getting back in contact even though it was making his new gf uncomfortable and he said he'd stop, he's telling her he misses her and he's telling her he's having/had a wobble in his new (ish) relationship......
Honestly, it sounds like he needed a much longer break between relationships and to properly get over (or not) the relationship with his ex before involving himself with another person. His behaviour is very unfair.
Anyway, to get back to my first point; when what's someone is saying (I can't believe my luck, you're too good to be true) is at odds with what they're doing (and what they're saying to another woman, I'd pay attention to that. It's worth keeping foremost in your mind when considering your investment etc.
Maybe you wait and see, maybe their contact/connection will fade away over time, as they get more long-term etc with new partners. But one things for sure, what they're both (particularly him, because she's not the one apparently telling him she misses him and that's she's having a wobble in her relationship) doing is deeply unfair to you and her partner.
I'd like to see how chilled and secure they'd feel if you and him were the ones acting like this "xxxxx, I hope I find someone as amazing as you ..... I miss you ..... I'm having a wobble in my new relationship" ... Yeah, im sure they'd be really chilled and happy if this was coming from either of you to an ex. Many a person would have exited stage left already.
Fwiw, if my ex told me they missed me and that they're having a wobble in their new relationship...I, rightly or wrongly, would think they were testing the waters/hinting/open to coming back ... I certainly wouldn't think they were settled & totally happy with their new gf.