Coparent acting funny

[Clmtht]

My ex (who has very narcissistic tendencies) started flirting with me a couple of weeks after finding out that I was in a new relationship.

That relationship ended (for other reasons, not my ex), and he continued to flirt and suggest sleeping together for old times sake etc (p.s he has not shown any i interest at all for the last 2 years since we split),

I went along with it, knowing its some sort of game but I was curious too after 2 years. He then suggested we take our one year old son out together for the day, maybe once a week. I said okay, but maybe twice a year as we arent together and I dont want to confuse our son. Also its not appropriate if we were to meet other people.

Anyway, last week he invited me to his mums birthday gathering as I was picking up our son anyway, he just asked me to come early and stay for a bit. Thats when we slept together. This week we are due to go on this family day out to the natural history museum.

Why is he doing this even though I'm now single?
Genuine want to coparent nicely or some other agenda?
He's been distant from me since his mums birthday.
I have no romantic interest, nor interest in reconnecting as I know it would be a disaster and theres already a lot of water under the bridge. However I'm just finding it all a bit strange.

Any ideas or advice?

Why on earth would you do this to yourself and why confuse your kid? This won’t end well. He’s an ex for a reason.

FFS, don’t sleep with him!

he thinks/thought you were in a new relationship and he doesn’t want to lose his control over you. That’s all that this is about. He doesn’t properly want to get back with you, he just doesn’t want anyone else to have you. He will drop you like a hot potato once you are back under his control.

You moving on is wounding to the ego, with someone like that they'll act to make sure they don't feel rejected, once they feel they've got you again, they're happy to drop it.

Lesson learned. He got what he wanted and has now distanced himself. He will probably start flirting again at some point. Don’t do it again unless you want to be a living breathing blow up doll

OP, talk about letting him have his cake and eat it! It’s all just massaging his ego - you may be his ex, but he’s seen that sometimes when he tries it on, he can succeed. He likes the control - he didn’t like it when you had another relationship, and by taking you to bed, he’s proved to himself that he has the whip hand. You really need to move on - if you find another person, they are not going to want you hanging round with your ex or going out with him with your DC. My advice is to put as much space between you and your ex as possible. No more mixed signals that he can misinterpret as you still being interested - keep it cool but civilised for the sake of your DC, but very definitely only absolutely necessary contact. You say reconnecting would be a disaster - so don’t. He’s an ex, not a FWB, for heaven’s sake!

He’s doing it because he can. And he’s getting a kick out of knowing you’ll let him.

He's hoovering you for fun and to maintain control.

Yep agree with what others have said. It wounded his ego that you could be over him and want someone else. So he set out to seduce you to prove to himself he can have you anytime he wants. Now he’s done that he doesn’t need you anymore so he’s distanced himself.

If you just wanted a shag then fair play but personally I wouldn’t let my ex think he could sleep with me whenever he wanted knowing he wasn’t worth my time. Don’t do it again and be aware of what he is after — an ego boost.