Relationship jumperšŸ§šŸ˜­I think thatā€™s what itā€™s called

Me and my ex literally broke up three days ago Iā€™m just now getting over him because weā€™ve been together for a long time . He already has another girlfriend and said he never loved me and I was terrible girlfriend but I literally did everything for him the only thing I know he didnā€™t like was the sex because Iā€™m not experienced,heā€™s only the second person I had sex with He has my name on his hand and I have his initials on my chestšŸ¤·šŸ½ā€ā™€ļø. I reached out to one of his exes ik its weirdšŸ˜’I was in my feelings when I did it. But she said they broke up for the same reason we did (he was cheating,not communicating,argued a lot) they dated for five years we dated for two. The ex of five years said he can never stay single. Was I the problem or was it him?