My LTR of two years lives w it's her mom. I'm over alot and am pretty intertwined with her family. Her mom got a new bf and they probably been talking about 2.5 months because her mom doesn't want to put a label on it but from what I see he invests a lot in them (saying love you, buying a lotta stuff, getting my gf stuff, staying over, ect). He's ok to me I know he's probably throwing money at the mom to get a nut because he's pretty simp so I don't really trip. However today he was over ande and my gf just got back from my house and I say hi but leave again to get something. But before I drove away I go back inside to get something and he sees me and says what's up. I give him a handshake and I get my stuff and my gf is down the hall where he's at and he gets really close to her and I see them talking but walk out the door. I'm not trying to make any drama and make everything weird so i just leave. My gf comes out to my car and tells me that he gave her a Starbucks card, but the way he did it was kind of creepy, then she tells me he tried to slip the card in her back pocket so she kind of moved. My gf got a fat ass so I know what he could of been thinking. What would you do about this dude and how would you treat him after something like that, also how should I react to my girl? I want to alpha male this dude but he's a grown ass man who's established and I'm just a young bull who might be getting jealous over something stupid. Should I ignore him and belittle him In my head or be vocal? But if I let this slide it could only be the beginning, thanks