unsure

Mi
So I need some advice, I've been in a long term relationship for 4 years with my bf but have been urged over the last year or so to experiment with girls sexually. always thought I was straight until I got Into a relationship and realised I'd never tried it. I love my bf and have no intention on leaving him but still have this urge and feel as though I'm missing out. I've told him in the past that I've always wanted to experiment with a girl but we have not talked about it seriously in the last couple of years, not sure if I'd be interested in a threesome either as I would get jealous of him with another girl. I also wouldn't cheat! Anyone else been in this situation? Help!?