Just try to continuously remind yourself that whoever you’re dating is with you for a reason! Accept the love that you are receiving and realize that they are yours and you are theirs. :) It might also be worth talking to your boyfriend/girlfriend about how you’re feeling. Not to be all, “omg who is that girl~”, but rather a serious conversation about how you realize you feel jealous occasionally but are working toward fixing it; maybe you two can find a way to work through it together. Honesty is a great start to forming trust, which will help to mend the issue even further. :)