is he cheating?

so my friend texted me and said that my boyfriend was hitting her up and flirting with her all weekend. and that he trying to hang out with her and hook up and bring her food. she said it was over snapchat but she didn’t save any messages and she unadded him before she told me. i have no proof that she did and he swears that he didn’t. what do you guys think? we have been together for almost seven months. he took my virginity and was my first kiss. he has a lot of money invested in this relationship as well