I feel my friend is just using me

One of my closest friends has a habit of using me whenever she has to get something done with her family. She asks me to help with her household stuff and I am usually happy to do it because I’m single and have no dependents like she does. I am starting to feel as if she is taking me for granted though, and want to avoid getting into that situation because it may lead to some issues between us down the line. I want to draw boundaries but don’t know how to without coming across as a selfish friend. How do I do this?
You’re not being a selfish friend if you put yourself first now and again. To help a friend is to be selfless, but to do it often and constantly at your own expense is not a sensible thing at all. Your friend is probably not doing this on purpose, because she may have no inkling of how you feel. The best way to avoid any misunderstanding is to be as honest as possible, and as soon as possible. Talk about wanting to help, your struggle with boundaries, and what you are or not willing to do. Talk about timelines and expectations, and treat this as something that can bring you both closer instead of cause you to drift apart. It isn’t difficult if you are capable of speaking out. Be direct and your friendship will be fine.

I broke off with my boyfriend a few months ago and recently saw him with someone else whom I am told he is engaged to. This information has upset me and made me wonder if I made the right decision. How will I know?
It’s normal and natural to question oneself when one’s partner moves on. Think about why you ended it though, and give yourself credit for doing what you thought was right at the time. This decision may not make sense now, but there is often clarity that comes with hindsight. Wait until that happens.