virginity / sex

Well me and this guy from school have been flirting all year. We ended up talking at one point . So now the sex talk came up. Mean while I'm still a virgin he's not. He said he can help me with that . So my dumb ass said yes ... honestly because I feel ready to have sex. But I'm not sure if he's still with his girlfriend or whatever she is . I told one of his friends that I'm cool with but not directly but she said all her guy friends have girlfriends. So I'm not sure if I should still do it . I feel like I'm doing something wrong even if I still want to do it . Should I ?