Relationship advice

So me and this guy have been dating for about 5 months but it's been a rough 5 months like any other relationship. recently I've decided that we weren't going anywhere in our relationship and I basically told him we needed a break. 
I found out that he was  talking to some other girl two weeks after we stopped but he denied it. It's been about 4 weeks since we spoken. I miss him so much and idk if I should text him or not