Why are people so cynical about love?

I notice a trend where many people seem to be cynical about love and relationships. I have had some bad experiences in the past but have found a wonderful person I hope to share my life with.

While some of my friends have been supportive, I noticed that a few have been a little bitter about my relationship. They resent the attention I give to my partner and seem to project their own issues with lack of love on in their lives on to me. I hope that they can find happiness too and I try not to be sanctimonious or “rub it in their faces” but I also can’t hide fact that I am happy with my partner.

I notice that in general, society seems to encourage people in their 20s to hook up with as many people as possible. I am not a prude and I certainly participate in some of that in the past, but now that I am moving beyond it, it is hard not to feel like an outcast at times.