What do guys feel is their responsibility in a relationship?

Impossible question to answer because different people -- both male and female -- will have different expectations and different commitment. It isn't possible to say what "guys" think. A relationship is built between two people and you need to find somebody who shares at least some of your ideas.

Depends upon the strength and weakness of each person in the relationship.

At the very most, it should be a "Partnership", a shared responsibility.

Well, you cannot force someone to be in a relationship with you. If he doesn't want to be your boyfriend, for whatever reason, and this is a problem for you, this may not be the best fit for you.

Also, he could be using this as an excuse NOT to be in a relationship, but he doesn't know how to tell you. So he comes up with a lame excuse.

Take a step back. Look at the entire situation, not just this one thing. What do you guys have in common? What do you guys fight about? Does he share the same values as you do; if not, are they something you can live with?  Has he been in other relationships? If so, how did they end?

As you are evaluating this, I would make a plan to start saving your own money if you haven't started to do so already. It could be saved for a wedding, a house for yourself, more education, etc.

Just as an aside, unless you are married to each other, you should not buy a house together. If and when you break up, this will be a mess to untangle. Good luck.

Generic, but essential: Treat your partner with respect.

About 35% of Americans do not own their own homes.

I doubt that all of them are intent on avoiding a relationship until they can buy their own homes.

I suspect that your guy's wanting to have a home before a relationship is just a red herring.

I suspect there are many other reasons that you may never discover.

One of them is to not listen to his stupid relationshipless friends.

The more things change the more they stay the same. The idea here goes way back when men were the breadwinners of the Household and the wife or GF was the mother and care taker of the house and its has passed on thru the ages.  Womens lib or rights mostly came to be around the mid 1970s near the end of Vietnam War so it hasn't been that long since women broke out so some of us , like myself , saw my Mom stay at home and are old fashioned but its the way Society is now but its inbred that guys take control and women cant say they don't like it sometimes like on dates as to who pays.  So now life goes on and also which is why so many women want a women in the WH this year without regards to how evil and corrupt the woman may be

COMMENT TO QUESTION

The guy I'm seeing says he doesn't want a relationship because he doesn't want the responsibility. (He has said he needs to buy a house & that, while "it will be twice as hard" to do so by himself, that's what he needs to do.) While I'm not rich, I now have a very decent state job. As for a relationship, I would not expect anything other than mutual love & support … & to be a part of each other's lives. (I certainly do not expect him to be my sugar daddy.) I would like some male insight on this.