This is not a relationship. This is friends with benefits. If you're wanting more, you'll have to move on. If not, just go with it.
Not necessarily. There are lots of reasons, not the least of which is that he's addicted. This is real. Don't shame him, and don't think that it's you. You may want to see a couples' therapist to help you with the situation.
You can certainly have that discussion after going out for awhile. This is 2018, and there's nothing wrong with splitting the bill or trading off who pays for each date. However, you should consider her financial situation ... and yours... before arriving at a solution.
No one will replace your mom. Unless your dad asks for your opinion, you should just support him in his decision-making. It's very hard to start dating again, so he'll have a learning curve. Don't pass judgement on something with which you're not familiar.
It's your house, so there's nothing wrong with telling them that when at your house they are expected to help clean up. Their parents are not doing them any favors by not having them do chores, including cleaning up.
You may want to provide your parents with educational material and research. The fact he's using edibles would indicate he's not a typical pothead. You can explain that, too. Weed has been shown to handle anxiety quite well.
You don't need to say anything. Why would you? You don't say anything when you go out with a heterosexual couple, so why not just think about it as just couples double dating?
Don't say a word. You don't need to. Be smart and make sure you use protection. You are not going to change his parents' minds. That's between your bf and them.
Approach it from a health standpoint. Let her know how much you care about her and that you are worried about a health concern. Be a gentleman.
You need to see a therapist. You will go through the stages of loss. The pain will begin to subside but not the loss of trust. If it's not handled properly, it could interfere with any future relationships.
This truly requires family therapy. First you're going to need to find a highly qualified therapist. You are being placed in a situation that you're not trained to handle, AND you are emotionally involved. Don't do this alone. If there's a chance to salvage the family, it will require a lot of work.
The best advice is to get some short term therapy to figure out your role in the problem. Clearly, you are sending out messages you're not aware of and to the wrong people. A good therapist will help you sort it all out.
You seem to have a good handle on your feelings, which is very good. Some professional help would go a long way to helping you sort more things out. That way your mind will even be clearer.
Here's a fun way to handle it. Instead of getting mad or saying anything, just look at them, don't say a word, and SMILE. It drives people nuts. The key is not to say anything. Works every time.
If you are reasonably close to your bro, yes, you should warn him. Usually the one cheated on is the last to know. Family is worth protecting.
Just relax and be yourself. Talk to any of your friends who've already been through it. They'll have the best advice. You are dating but with all the knowledge you didn't have when you dated young. Enjoy!
Ask her what she'd like you to do. Sometimes people need someone to advocate for them. She genuinely may not know how to handle it. Be gentle. Don't be a jerk handling it.
In any relationship, both partners need to be comfortable. If you are not comfortable until his divorce is final, then keep your boundaries so you won't regret it later. If he's really interested in you, he'll just have to wait. Don't ever be pressured. Always blows up later.
You can certainly poke back, but don't cross that imaginary line of disrespect. He may just be trying to be playful and would enjoy you playing back. If the put downs are personal, you'll need to be honest with him about how you feel.
From what you're saying, there are major issues in that family that are sitting just below the surface. For her father to try to undermine the relationship says that there is a major rift between her and her father. You're stuck with a no win situation. If you tell her, he'll blow up at you. If you don't tell her, then he'll keep doing it. Get some professional help on this one.
The most powerful element of a person is her or his mind. Cheating doesn't necessarily need to be physical. Obviously, this is upsetting to your bf, so if you know that, you have to ask yourself why you keep doing it. I'm guessing it's about your self-esteem.
Unfortunately, his father has provided a crappy role model on how to handle a relationship. That doesn't mean your bf is automatically destined to do the same. Talk to him honestly about your concerns and see what he says. His father's behavior may be just as upsetting to him as it is to you.
That behavior alone doesn't make her an alcoholic, but it certainly sends up a giant red flag. Tell her that you are concerned and would like for "both of you" to live a healthier lifestyle. If she continues the behavior, you may have to end the relationship if it bothers you that much.
Beat them to the punch. Tell them what they owe before they can compute it. If they push back, just tell them you are more comfortable just splitting the bill. If they persist, you need to disengage with them.