Why do so many people on the left still buy into the notion of "love" and "romantic relationships" when the two are nothing more but constructs which reflect only the will of the ruling class?
Think about this from the perspective of Dialectical Materialism. No concept in this world can be divorced from material reality. The family was always about property. As far as "love" goes, it ultimately serves the interests of the bourgeoisie in this day and age. Romance, the family and reproduction in the 1st World function primarily to create more consumers. Reproduction and family in the 3rd World function primarily to create more producers. Plus "love" plays out as a relationship of possession. There is no way out of this except to reject the idea of "love" all together and find fulfillment in something else. Sexual needs can be fulfilled through polyamory without any attachment (this is what indigenous peoples do).
TL;DR - Don't be angry if you can't find a romantic partner. By having a romantic partner you are furthering capitalism's lifespan, even more so if you have children with that partner. Realize your feelings of "love" are just hormones in your brain which are essentially the same things you get from eating a nice meal or exercising.