Just remember @Isitmeorsomething most men are full of shit when it comes to their magic number!
Men exaggerate and bullshit. Conversely women play it down. So a man who has had 8 women/shagged 8 women will say he has had 15-20, some may even say 25-30. Or more! A woman who has had say, 20 men, will say she has only had about 5 to 8 men.
I had an ex who used to brag that he had had about 15 girlfriends - ranging from 3 weeks to 3 months - and had fucked another 40 or so on top of that. Every time I went to the loo when we were in a bar or club, when I came back he would say 'you just missed this woman, asking me if I want to go home with her for a fuck.' And every time he came home from a night out with 4 or 5 mates, he would regale me with tales of all the women that came onto him, offering him a fuck. All his mates would say 'how do you do it mate?' he would say 'just got it ain't I?' 
He made stuff up (I believe) because everywhere we went, men whistled at, and catcalled me, and said 'hey blondie, how are ya?' Even in front of him. Even on the night we met, 3 or 4 other men were chatting me up, so I believe he was massively insecure. And jealous of the attention I got. He used to neg me too, to try and put me down/keep me in my place.
Upshot was, he was full of shit, and after a few months I realised it. Women were NOT hitting on him, and like fuck had he shagged over 50 women! 😆 (We were both early 20s btw!)
Your DP is a lying shit OP. Fact. By their very nature, all men are liars. Some just lie a bit more than others.