Tell me what you think😕

Okay so I have been dating this boy for about 5 months and we were taking it slow and talking for 2. We are in a long distant relationship him living 14 hours away but we talk everyday. We are planning for him to visit at the beginning of summer which is a whole other problem by itself😅 but I have this ex-friend who seems to always be trying to flirt with any boys I talk to (basically steal ppl from me) and this had been going on for years until we drifted away but she keeps following him on multiple social media accounts and he keeps blocking her over and over. I trust him and all but she always seems to get what she wants in the end😕 I just don’t know what to do or say. I just need some support😔