Thank you both for your replies 🙂

Inky, to answer your questions…
1) His following seems to be mostly attractive women… I don’t think he has a purpose or ‘theme’ per se, its just random moments from his life. No idea what makes an photo ‘Instagram-worthy’ but a lot are of things that make him look good.
2) Maybe… 🙂
3) Yes I understand that, hence trying to be understanding… but shouldn’t there be a point where that doesn’t matter to him/gets boring? I mean, he’s NOT a single guy any more. If he keeps up an area where he is, surely that will be detrimental to the relationship? Plus, it’s not like he’ll lose a great cartoon career by coming clean about me 😉
4) I do feel like he should ‘get over it’ but I guess that’s what I’m having difficulty in expressing… 🙂

Chris – your post made me well up a little. You’re right. All my life I have had to fight being too much of a people pleaser. I have struggled in overcoming the feeling that I always need to be nice and happy (one friend once angrily yelled at me I wasn’t ‘bloody Pollyanna’ which hurt me to my core but demonstrates the persona I had!) – though I do much better with embracing my negative side these days, it is still sometimes uncomfortable for me, and I think particularly in the romantic relationship (my first serious relationship), it is hard to accept that someone could want to stay with me if I dare to display negative emotions like anger, sadness, jealousy. I think your advice is good and I have been working up to having a conversation with him – I just want to get the timing right. Really appreciate your insights 🙂