The honeymoon phase of a new relationship often absorbs the partners attention so if the relationship is still in that phase I wouldn't take it personally and eventually assuming they don't break up you'll reconnect at some point even with the relationship as it's a temporary phase after all so don't treat it like you aren't still friends if nothing bad has happened but if he's your only friend you have that connection with then yeah you should try to meet other people and you will like I've lost close friends over the years and met others which as long as you have a solid idea of who you are as a person you can explore that more in times you may not as focusing on yourself is never a bad thing