My jealousy eats at me I ‘23/F’ ‘23M’

I ‘23 F’ have been dating my bf ‘23 M’ for 4 months, This is the best relationship ive had. He reassures me and we actually talk things out. As well as we have many things in common But Besides me going onto his reddit and seeing his old search history before we were dating, he has never given me any reason to suspect he would cheat or disrespect our relationship. I still have this feeling of jealousy. It controls me. I dont want to feel it; i know my bf loves me and i have faith he will do the right thing behind my back but i cant help myself when i see him having a simple conversation with another woman. Laughing with other women, ive been able to control these feelings and thoughts but recently they have began to slip up and not sure why i cannot control it and i spend hours spiralling, questioning my self worth. I dont know what to do with my own emotions anymore. I cannot keep feeling resentment because i lack the control over the relationship and control is not love… any advice on how to cope?