How to help a guy who MAY be in an abusive relationship

How can one help a guy who may be in an abusive relationship? I'm feeling a lot of feat and worry.

Can you explain the situation a bit more? It's hard to advise knowing so little.

A good friend has changed a lot recently with his gf. He doesn't seem truly happy or like himself. His gf spends every moment with him and he is hiding texts and calls from her and saying he will do one thing but then very randomly not doing it. He seems to be drinking more and possibly having money problems though this could also be legit from the work issues he had. He also overslept once for work recently which is never like him. He's been having erratic mood swings. His eyes seemed watery a few times. When he is not with her,he constantly has to text her all throughout. This girl has to go everywhere he goes. He's very scared of losing her. He doesn't seem to care about anything else anymore. This girl has done some low class things and shown she has lied and manipulated him but he acts like he doesn't care because everybody does as he said..he's become jaded from his wounds. His gf's daughter once seemed to possibly check on a female friend of his once which is disturbing to try to see who she is. She's threatened to leave him before. Acts very fake nice in front of his family or if she knows his family is around but otherwise does not care. Have pretty concrete proof she is twisting him to change his decisions at the last minute to ones she wants. She seems very sexually possessive like she wants everyone to know she is sleeping with him. Friend looked worried about angering her once about something taking too long which I was NOT used to seeing and did not like. There's other things,too. There's just been something not right. I don't know how to be there. He constantly just seems to be walking on eggshells with her. The sad thing is,his father seems to think she is so great and will help slow him down and be great change for him so she's done a number on impressing the father.

In my honest opinion:
Nobody has the right to claim anybody for themselves.
Nobody owns another person.
Each person is a free agent to come and go.

People get angry because they fear that if people, places, things, or situations don't go their way, they will not feel okay.
So whenever they don't feel okay, they will blame people, places, things or situations for their feelings.
When in fact, it is themselves to blame for not knowing how to cope with not feeling okay.

Ultimately we are responsible for our own thoughts and actions; not anybody elses.
We are the ones who have to learn how to cope with our our fears.
It is our fears, not other people, places, things or situations, that causes all our problems.

People who are abusive are fearful people who do not know how to cope with their fears.
Basically, they are scared. Their own thoughts have scared them. They have scared themselves and are blaming others for it.

Pray that one day your friend sees the light, leaves this person and returns to being the person you once knew.

They're so blinded that confrontation will get you nowhere. And likely kicked out of his life. The best you can do is support him and let him know that you're there for him.

Most of what you shared is just assumption what might be happening or it seems to you is happening. You don't seem to have any proof of abuse. Oversleep for work or texting her or having money problems isn't really a proof. Are you interested in him romantically?

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Yeah,that seems to be the best I can do. It's just sad because he's prone to girls being manipulative to him and trying to be controlling and he's the "nice guy" type. That's what i'm trying to do more of now,though. It makes me sad there are so many shady women out there.

You are right. It isn't proof. It's just bad vibes that I can't confirm yet. And,admittedly some things seem odd,like the first few times i met her she seemed really nice,and i normally don't get fooled by people. I am not interested in him romantically but I do worry a lot about him in general.