rant/vent?????

so ive been talking to this guy for a while and everything was good we have similar interests and humor and hes my type and stuff and we get along but recently a girl who's in a friend group we're in recently told my friend (who ended up telling me) that that girl and the guy fucked last week on monday and i don't think him to be like that sense he's been very sensier with me but i also dont think this girl to lie to my friend or to me about that and im getting worried because this girl is his neighbor so they've known each other for some time now and when me and this guy started talking i found out that the girl liked him, but i was told she would stop sense i wanted him but like i just dont think him to like sneak someone to his house and fuck them but i also think that the girl isnt the kind of girl to lie about something like that and i was asking him about it last night and he was denying it but im scared that he’s lying to me

another thing that has me worried is that when we started talking his ex approached me and told me that he was abusive, he cheated on her a lot, that they've been on and off for years, and that she lived with him for 6 months, when i asked him about it, he said that she was his crazy ex, that she lived with him for a year because her mom kicked her out and to be nice him and his family took her in to not leave her on the streets till her mom accepted her back into her house, he told me that they broke up because she cheated on him and told me that she's tried to make lies about him to some of our female friends but once realizing that they weren't interested in him she stopped, when i asked him why she approached me to tell me these things he told me that it was because i was a female who regularly spoke to him

when his ex approached me i could tell from the start to not really trust her because something about the way she spoke made me not trust her, her tone seemed as if she was trying to be calm but I could hear slight aggression and possessiveness?? idk how to explain it but the way she spoke made me not believe her

when she told me that he abused her i didn't believe it as he is the kind of guy who will stop talking to people and give himself time to mentally recharge in order to not take things out on people (i know this because he's done that before) i don't know about the cheating tho he's overall a sweet and funny guy but that doesn't mean he wouldn't cheat on someone it just means he's a lot more trustable (i say this because ive gone to him to vent plenty of times and he did nothing but listen and comfort me in any ways he could) but idk im kinda nervous i dont know whos lying, i rlly like this guy but like idk what if he is what if he isn't.