ex gave me a std...

So I had my physical at the beginning of the week and my doctor called tuesday and told me I have chlamydia...I've only been with one guy(who was my boyfriend and I was deeply in love with him, he was my first for everything) so now I know he's been messing around w other girls for the 2 and a half years we've been together. My doctor has given me treatment and I haven't talked to my now ex boyfriend since....please no mean comments I'm really emotional and just need some help😞